Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcebc4dad8e4f4e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 05:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62e542d554ce245484d6a0220c82ec24 SHA-1: a7a5c9545248db117076332b3400c142b2a57a4d SHA-256: bfcebc4dad8e4f4ec579648a395f3b4b3179c2f8919c107aa45b1eebb7c18347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed to manipulate search engine results or direct users to malicious content. The presence of compromised CMS upload links further supports this, as these are often abused to host malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://studioassociatoemc.com/userfiles/files/doloku.pdf In PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/joribudubopigus.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/86775328973.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/72368060193.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613151604c8d0---bolovigudomoxarinawid.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/37208246888.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/zewofugukutisizujakin.pdfIn PDF document text
    • http://wohingltd.com/userfiles/43901586167.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/bebedaguvotupuka.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/videbobokikowimi.pdfIn PDF document text
    • http://robedecreateur.com/img/files/64208006802.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bdebd1d13c254736f4311fd3fe13222e/nonavutiganatubofaseraze.pdfIn PDF document text
    • http://sjanzee.nl/file/57824583396.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32ff5a423---bomekuwusav.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/48030000632.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/jebimol.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/peluwovojemotafagub.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/9897019215.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fafagapirawopiji.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/lujumefoxexok.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec523ebada---divubad.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r95q406n14hmid3opmqd8nv5q3/83095540535.pdfIn PDF document text
    • https://zagi.hr/files/velujibagodaput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+prince+and+me+123moviesPDF 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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 16148 bytes
SHA-256: 61c8305b356a1e5fd30222bd69eba82b11fc9e83efe3c13ea7a27780d6b97b5d
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 11008 bytes
SHA-256: 880a7415ea9b2919ed9de39d6289317988d860560efb3061fa70e8bf19de2b9c

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