Malicious PDF — malware analysis report

Static analysis result for SHA-256 020bfea11f4692c2…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 04:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9706f2caa2fa615805e37f35ca7d13c1 SHA-1: 28d7362642ce3e07fd1f8b17dbcaff9aed794314 SHA-256: 020bfea11f4692c2464a9a01955bc74a60c3d990368ab02092b7f39b38f746a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary function appears to be redirecting users through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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 http://goodwill.pl/userfiles/file/71472268213.pdf In PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/58ser6smgc31fbvh62bissbu45/46728023602.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/sowixoxaxitagoxeganadamo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59683f2eae---zexujurunukoziri.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a45fabe8b---kifavinoxirarusapaxelosu.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/fodox.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/fukolujokonexusegupegaji.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cff2c2852755e7dda3588b51abe53273/27112837835.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a4f3079d0---79776447459.pdfIn PDF document text
    • http://flgr.ru/files/files/vurudod.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/276e3d3b7e7a360b24411c344526680e/71037188912.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/37983734899.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/sonazajinusagadopad.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/aad167cb2d172d4a10cccc458f5a4d3a/34645555037.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/pejasolilizovatawaduk.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7027b4294024a31c6460e5b9cf9c0302/bawupo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/64039178390.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/98367297923.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2baa6d034---saguwesutuzukupimowab.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded712df27---muxagosekonigomazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lydia+hall+scholarly+articlePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/42687998058.pdfIn PDF document text
    • 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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 17944 bytes
SHA-256: 60eed3b348c03eac497ed177dd2b872cb59abed8bec87bc6b33e3141bf22d066
font_01_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 10432 bytes
SHA-256: 3d8a613c771b63296bf26b90ec588bd1af500987e9b0f4ce3c3106bfe6042744
font_02_sfnt_off000139a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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