Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9eb33a405885b65…

MALICIOUS

PDF

163.8 KB Created: 2021-06-26 14:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 417a8085160747da86b1ae14dc61dd6d SHA-1: 495d1e1774fad6ddeff72180f0d6fed7399a995a SHA-256: d9eb33a405885b65a9410d39a54100d74ca77596465c1594792e9c4331c8ac97
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of a 'Password-protected archive handoff' heuristic, combined with a 'Callback phishing phone lure' heuristic, indicates the document is designed to trick the user into believing they need to provide a password for an archive or call a number, likely to facilitate the download of a second-stage payload. The numerous embedded URLs pointing to compromised WordPress sites and other unknown domains further support this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f134805bd7---26050738231.pdf In PDF document text
    • http://s2ipower.com/survey/userfiles/files/78310949200.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cm325ma8jfnsqn6hkfqf92ir51/xenixisasovabunak.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f66b90e6b---24315891929.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6t5bsc5pqas719if8lfu7j34od/74550998784.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e9322c282a2a5b98c0a74b21436ab0af/divefove.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/648eebd94a83f03d0679dc7994e4e65d/76842018402.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/69451607800.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/13703733747.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f42117c4---mebobalurenumotezo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/55c5f1u0dpnudjbuer85t71kd9/nanexewujipofafop.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c505fcda---77766844333.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/391acc2c41a4fc0e56b62738347e1823/dupizeparopenu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c585b4da---55203217985.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/29257836489.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/76133266104.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/33353216210.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5ff64f65---noxurokuxir.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af924d22192---mikafetowazopufolozu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81c92094a---34588941170.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dk1vscstk0opiv4qmt245p9b7r/karobegadasufuti.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/42263573600.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2h96k9s56e192svm0tm0qv3h2m/dusemotofarotiribopekawi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160accde56fb37---dawexopomavazetezepovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jack+frost+rise+of+the+guardians+full+moviePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000237c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237C5 18604 bytes
SHA-256: 74e815117d48f8514f6d0e690d405812849fc6d0bad96f10ba84812e31362dbc
font_02_sfnt_off00026755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26755 11172 bytes
SHA-256: 49d5fb54fcb76e5e730f8c0b31697fd57327088ce193ad4a88e9a8d67f2d03b5

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