Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3df7c1b0c5d639…

MALICIOUS

PDF

78.9 KB Created: 2021-07-26 05:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5026ef4fb102b468c118b506ab79ab0 SHA-1: 6c3da4fe24b776f4b7411e2b7cb1f3398efe4ac3 SHA-256: ab3df7c1b0c5d6394110df66bc9a957c974e8b263ea4b055ad72930566e5e213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a tactic to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/cd6b788b405b8e89d0f7d6d196761be3/66503827416.pdf In PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a4663bc8563c5bf327f3e1a61bce7052/13391444555.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9ee6ca54f703658ebb3dd845bb6e4584/setiriwolowozexatasitomed.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/patubivi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c408108031323fe3d7eb6d9196bc6ab9/mexavekuzuxedadudiwe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e79b0707---73796434534.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/zavatenaberamofivewerigux.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1ac7f07b6effaea13fbdd8090224dcd6/fipowimenokix.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rm9uk32i4hejob7vucn1vssr7p/35767394984.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/16662649751.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6284facf46---mudosudamimerudawazos.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xavesadafodedefe.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/46844017377.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0762b7924---vapafezisidepiwixotafog.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/160b217b1e6664b14f87a8b56c93445e/kigoniwofavarekes.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/sudimeda.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/3e8c97e2ecdaba359a8b5b424448c2bc/pipaw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f306c75caee---wefodevepasegen.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/fasubobaketazubusuredixob.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ede4afee48f4d55216cf87142aa7b782/21442417929.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/40438677669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=frigidaire+professional+refrigerator+parts+manualPDF 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_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 10920 bytes
SHA-256: 44e5657fcef2a12c68525c4711714b9ff599f3b59d5e58b3d09ac681e6d3e3d2
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 17136 bytes
SHA-256: 2daa0bab0ec35e547caefbba9ee46cf326fe583aeb74695786bf0799ac895a53
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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