Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c444008d614d8a0…

MALICIOUS

PDF

105.7 KB Created: 2021-07-17 06:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 509094affcc53d285d97a6c67640a5d5 SHA-1: d2a778f638a4a341bf5057d6d9ea3e244d4c2461 SHA-256: 3c444008d614d8a0e357ec9264479eaba41f6f671784e99831e337de20e8539c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests a link farm designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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 http://vuatoyen.com/uploads/userfiles/file/83712054560.pdf In PDF document text
    • http://orderkiwicafe.com/uploads/files/pomasa.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1328e87bc7fc1b9e53eac6f6c7ed180d/30315938895.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759610c9312---zelomezadovifisajajuvot.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080de2e44822---gejubox.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/22479795170.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9dad207b0---95470512158.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/36576138784.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0llmc34d96gm8m7qjrgc2jud1c/kinuteko.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/p6io4p9oqrtqsjf7i13nntdf5u/wivuzatapewixinilezo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/fokukedepiniduvifawofezej.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f757b140---dojafuxosuva.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609be04b36cc4---pibinaduwa.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/71ns06dvipiobj5kb59mvig5q3/zisunorigezulefosir.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa74abe00a---danugogumu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2647f7a6---fajafivejokanukutefedit.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/rijijopomujavigopufuwa.pdfIn PDF document text
    • https://everestart.com/images/stories/file/zilafikuvikirabag.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/vabofewepubawewumug.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2c764a58dbaab577a5cbbaf7707f7fc6/xulufo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc6b3272a---rumexabaganarobomu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7564506d---56364614400.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf3d5785c2---39305873837.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c9cb9eefc52652638bf85c2a0e42349c/82774874430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=embellishment+in+a+sentencePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 20416 bytes
SHA-256: 48466fc6f14c7a16a1e8c504f49a4b1d710c672819e5d847ca79cca26a864d89
font_01_sfnt_off000146cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CC 2496 bytes
SHA-256: 2e235c40018b5b5f8c30edf948616fd79af811310649897409e6bc29b59900d0
font_02_sfnt_off00015186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15186 16628 bytes
SHA-256: 8adadc8ab23567e26b8dd2859daae8dbefcbaa2396fc38af4159eed790695bfd
font_03_sfnt_off000168da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DA 10400 bytes
SHA-256: 59d37316d918f5e2c70e2dfc56baef1fb73a95110b172ba936e9245752124650
font_04_sfnt_off0001802d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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