Malicious PDF — malware analysis report

Static analysis result for SHA-256 8877d68f08f7b3c9…

MALICIOUS

PDF

95.3 KB Created: 2021-07-08 00:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a14c72a0861824b8798a49bf3e5ac59d SHA-1: 3132f7992a88c62009cf0ed20223043937db919e SHA-256: 8877d68f08f7b3c9fb547059c7962b9b4359a9b094b11793f01cbf379c4f2aee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these link farms suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a5644a10---59904095348.pdf In PDF document text
    • http://bafiti.com/sklep/userfiles/file/18197591959.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/89377744820.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/duvejow.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e914bc5be---33552966317.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4aca10e381c32208490670d6cc78d40f/59005546229.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/33o2v5pgjurt013703pjj6sav1/15887098670.pdfIn PDF document text
    • http://aps-mes.com/files/file/tarivaxujimafujimizaluv.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260dc3d7ab---83176775064.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/e4907c7c13af71aaedaead1c4fca072e/42919737255.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/db766240ba2ab511b1ea0e4357abe1a6/42121720830.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a34bc3109---97127669309.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/lalelinigelubafufemunedil.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094897ab56a9---jajalenixorazage.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6fb636c290e793d65af78b7db873b90a/5828330024.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/wemot.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1bp9uct2pftqbv6in5spo3npk4/38621027682.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/54159221916.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b503cefbe5626704ff8a2f99c06a4568/75576091421.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/61312306704.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f1f03673c1855b0e96c5477cc76fb58a/pazopivebiwevozesewan.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/81004385151.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/cc0ff052ddf599df689d7e271159cca1/ludumadulerovawimozalulew.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f3dc5a54---wofaribozifedemidojabel.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5396e264425e31d3ab17e70313aaa0e3/46140096682.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa7184023---79886370791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+japanese+art+of+decluttering+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 11092 bytes
SHA-256: 5ed1cd3d3badc636298e209f6676b311fac9c2b9c09902928855250865afdf3e
font_01_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 17024 bytes
SHA-256: 379f48fd045cad5cc38fb8fd76406c4aeee231998ae85540375834158161ba58
font_02_sfnt_off000155a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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