Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7db788d66e9544…

MALICIOUS

PDF

90.3 KB Created: 2021-09-01 21:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 637b3fd965373b6c9819d28980ab61a9 SHA-1: 60cff6d62f1392c9eba7b0f866ab5bd2e649c0f5 SHA-256: dd7db788d66e95449b20e48ccc539d91b06e3b90ba01a799053f6dc4a6d349aa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or serves as a phishing lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. These links are designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160782c6e9e65e---82285258.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/sesuketokiwifalipig.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/jenivozopaxipelosomu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/18rmdvt25kdcodvtdil9j8tlum/55694529814.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/95674001117.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91f79afdd---35678094262.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/98257036774.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54476725728.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf4f992d41---82579887267.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/826d9pjoftrcd6omo3ep17oi9c/60357692307.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/71620231852.pdfIn PDF document text
    • http://technocom.pl/editor/file/belufujananixisakemanaf.pdfIn PDF document text
    • https://alev.az/userfiles/file/jijolopejurumekezemegu.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/tofusejawepopugugofen.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5tsvsb0oo9hm48tf4eb80obp15/91033845648.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/380f75f82cc52d42a091f0077977b3d8/93732847388.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/83011668413.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/67388865942.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609218a442d1a---9336747871.pdfIn PDF document text
    • http://ellev.fr/upload/files/69567694215.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/420a5851f7283a45453874b61b45036e/sipiroxewazeziwinefuboki.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/gokomezabazoziwujakoja.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbb4c10f8---kejazi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1ln9enaqh31jga9f63s9gfrni6/koxovepogodan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=newton%27s+second+law+of+motion+definition+simplePDF 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_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 18420 bytes
SHA-256: 1156c8a1fbdd977f2d31c7cb15feb63fa4b404e21e345c2f00e2897bcc4fd334
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 10780 bytes
SHA-256: 87aa4a670f6023c1ed1d4caf2d9000285f0c360938317dfa424d50a033b065c0

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