Malicious PDF — malware analysis report

Static analysis result for SHA-256 71db2b2ca35a77c8…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 15:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb281f3ea22f73c772a94be0cb195a29 SHA-1: e6cfc7e504de3a5d22aef1946c4eec84393ff856 SHA-256: 71db2b2ca35a77c8527f4d3417d2f99fc5b79a290f3aa13c8c984d4bfee48350
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories, suggesting it's used to host or distribute further malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1159b6bf5---waridegebeguri.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/30ebab08965eb5b1cd0956d23ce677cb/kofik.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/31647441135.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608270a5ebb45---zapajeveburunukekakopefa.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/weleditepekanufex.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/64171408725.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/jaluwosufijapebuzuvinow.pdfIn PDF document text
    • https://blugarden.eu/file/53771149021.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2kjac9b6f8609nsltd8mf53vh3/87007093166.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e573a4c4b5---gikexuzitebivo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/81mrak9ig117nrlobvcacs8913/dibojowako.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799c6b6991f---nibalot.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/71510043424.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/8040142603.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/deboxuzozagifisib.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611c96dbf1684---rusovijanoxopolirenu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/lotimesonumowinapira.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/fapasarudaba.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/85192369139.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959fa4035f9---53313920365.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/34456974830.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/lipalusek.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/mevigesuvagi.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0ddef5700fa91e4a9710b57430a1b5fa/14337206769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+optimist%27s+daughter+analysisPDF 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_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 18128 bytes
SHA-256: 8ad07516068d55b0cc94f7dd8b90a24eddf2b85ef758bee475bcf7f20e6d393d
font_01_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 11052 bytes
SHA-256: 73cfcd81f040ef37731ef184fd548fcc8c89cc5f981ae3ada0824199ad7f24ff
font_02_sfnt_off0001473f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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