Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2bd36d89c10826…

MALICIOUS

PDF

92.0 KB Created: 2021-06-26 03:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6c9ccf685ce85b42cfae722be91cec5 SHA-1: 1962b134584c2c44c7bc60b1cbed5c9b6cce2bf7 SHA-256: df2bd36d89c1082626fbf91e465d041649ec433664713da18f4d3bc59e8a5fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=z+technique+for+im+injection PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70cc663774---matukegin.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/78964832936.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fabfadce0d---48741363655.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/85049763510.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9fe71e91---43508787956.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607692980467a---84600413992.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/20143270269.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/10538e389c32fe607b05a2f1def563e7/xomujenur.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/64613564734.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ufmpana0rdcr29slcrop4sm41t/46554292570.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a9514bf3c20d2a0e74f9ad6fd3b63dfd/fafowobadada.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/59466361302.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f338ce05a89638787466aaf69729e79a/nawiv.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/51234061856.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b64bcf951---30734118724.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fdda0507---40861262969.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/83256939525.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2beb036cc---70664990718.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160928bdfa12e3---80331140309.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/tizekubujepo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084140966034---pobevupebubiruf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160960dcf1c19c---17819707282.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_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 17564 bytes
SHA-256: f6e922a49e902c63c043907eed5bbbcb319dfb5236834c8e46af64d6c2214040
font_02_sfnt_off0001497d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497D 10564 bytes
SHA-256: 22abc2399f050edbe2cbad640d20a9feac006974a59d420b8d0cddff84c9a81e

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