Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74ff7efcbd496d6…

MALICIOUS

PDF

80.8 KB Created: 2021-08-21 09:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dab5ab5859369abee17e72e77483c67a SHA-1: 01c227be835cd6b6aade3fbc67d31c3baacb2d56 SHA-256: a74ff7efcbd496d6d01f279691e1af743b5c537b03b1228d1b78940f4050bfeb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. The embedded JavaScript likely facilitates the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://marbeyoyun.com/calisma2/files/uploads/nenanesu.pdf In PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/75248306222.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/sazanademizo.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/belewu.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/78134010815.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/51453513159.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2ecdf0ba---20097096249.pdfIn PDF document text
    • https://davnosti.ru/upload/12436674984.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/11673385306.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/kigaxazabifelukes.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/70950780079.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5291ad83e69d21de8164d8f93035a04f/42763838040.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/24582247161.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051210102416.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad54b2160---xofixajizibagilolugefil.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/25913941389.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/5804510009.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/pinewadobumulusufulud.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/leniguxiwunuku.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/85635668293.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/modamijubovuma.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/66393314688.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa56d464c0---49661782253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+the+3+methods+of+heat+transfer+how+do+they+workPDF 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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 10940 bytes
SHA-256: 290db991dd0f5a0c8421db2edb9974d0e870207f01d4b11f79ce916dc9124ef0
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 16008 bytes
SHA-256: 9f12eeb57b72326bdacfefc2b5673445cd921a2fda2515727d3ea70e894a7b02

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