Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa85f08c80f5b03c…

MALICIOUS

PDF

84.7 KB Created: 2021-11-08 13:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d84af2040e82d7299ac5a7c005a0da1 SHA-1: ba0032f68466d7587bc199a6f4e883bd3162c004 SHA-256: fa85f08c80f5b03c7ab959af389a6b1b0717977e0414a3c34293b9f3da98ccda
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://procogs.com/FCKeditor/file/boboxedufaso.pdf In PDF document text
    • http://unipsyclinic.com/userfiles/file/20211004045224.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/86779029744.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1213ba8d---pafuxovotovak.pdfIn PDF document text
    • http://vbond.hk/editor_upload/file/25271895343.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/nomevutovilobimirosumi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nagamoxuboraregidatozakoj.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/17609851447.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cbece4ae9ed8d48bde201aa0e24cf042/15282995135.pdfIn PDF document text
    • http://sun-eko.eu/files/file/turunuf.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/rinot.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/97823678737.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/70738943153.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/silumofivibonutipo.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/dilub.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/fodofugaxe.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/katutarotufadubanomodeneb.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f56b8112258411ba23dac024a8b155bb/27549021432.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/93922489081.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bbf2ef2c2c4ddf701ba8832e91f3bcf1/dimijuzatimajebet.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/nulejite.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616eb74138a17---45880520785.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/86153283564.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/26018390474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=sufi+martyrs+of+lovePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000be30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBE30 19624 bytes
SHA-256: 89ed9139c3ba000e8fb092e326bf968f51036e27555fce67c1f18c855dd7bdfe
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 10628 bytes
SHA-256: a80405c8c08672d1fa3bf5d728060584bec3c29da6b1a00d52e01c751e7abf64
font_02_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 20728 bytes
SHA-256: 5c7b3f4a6f0c9981aea83eabda8d8e2cc69c0544fd56a3c03ddca650eae7d83d
font_03_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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