Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe9bde00f68579c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 08:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be1ebd1b1e299f722556e6065706eece SHA-1: 82a72aa34c3252d9b9aa4d5511f4e7db9c9c0d34 SHA-256: bfe9bde00f68579cf6e2dc9f1cd054395703d185a81301943b8d8bf3ae40ee55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to lure users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nuestratierrapremios.com/campannas/file/kevixerejigeruvopibagowi.pdf In PDF document text
    • https://palcev.ru/userfiles/file/20206755987.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/35656796758.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/38403510239.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217152036205858.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/99680935632.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/80199548061.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/biriwopojeruteriwek.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078f24c06670---80624729826.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/6867317890.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a13902a1739---69841016036.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afd1023130---bidube.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zoweg.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210713131423_vlagpl.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/21281202416.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/76301722285.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/maguvigupeveseb.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/sipujinevaki.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/sejos.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/sufesukenonuvaxiziteb.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4531ab265---pebolinugaxogof.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/tevokapomenuvuxibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=loctite+554+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 17128 bytes
SHA-256: 5d2d57633619b9bf1f9bb5be4385db7fcf60b4fc4d2f461e14e3114e8193cf04
font_02_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10200 bytes
SHA-256: e4e0fc4a07ce0b3410fa9309e4127561e27866d2dde0a0b8a3408e7e5a81fa58

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