Malicious PDF — malware analysis report

Static analysis result for SHA-256 23249540a4f05fd4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 16:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 036ad47f80fff176ff2b8793a6a11bcc SHA-1: bb16c67088b32d3da8f361c28abe6d94069dbc0b SHA-256: 23249540a4f05fd45921153a9b102f00f30a9f74425c5d9eba67174ad5b19681
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable domains or compromised CMS uploads. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. No scripts were extracted, but the PDF structure and link farm suggest it's designed to redirect users to malicious sites or facilitate social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://y3stwk65l-mn9.com/contents/files/jodex.pdf In PDF document text
    • https://ketdoanbus.com/webroot/img/files/87513633375.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab3480045---dazip.pdfIn PDF document text
    • http://njchemland.com/upload/files/3466781412.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/lujokivanikaxe.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686e0f1192---29250589628.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/32585506459.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354c7520b25---59184178852.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/fafikemug.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tajuvubup.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/waduwokozaj.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/korad.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132945483801---19982591417.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/76774261610.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed83415b5b---gixovekamanixakonosaxira.pdfIn PDF document text
    • https://irantruck.ir/data/file/ledagej.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/51964331682.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/43571527927.pdfIn PDF document text
    • https://brs.jo/userfiles/files/fefiveseligidirujoredi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0d506dec---segepitinomumoz.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/81368380859.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139e88d76c8b---51235262057.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613676548dc1d---sipigazelobededoge.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/jeduviruzutokenuxapi.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/navowiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kostya+vasilyev+wifi+managerPDF 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10816 bytes
SHA-256: 9611c77b229bdd71d05f72b039179b19e0a690a813f8de7f7d05ad5733d948e2
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 20112 bytes
SHA-256: c5c79210c0ed233584f4eb95b9e2d6aa5f8969ae552081a657d3fd4aad6f5610

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