Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f84a8ed5d5ac87…

MALICIOUS

PDF

81.8 KB Created: 2021-06-13 22:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 444306e984e4fbd5d42cf9f1de4b80d7 SHA-1: 24e0f51522b8992e0c044fed35cc8958d8b948f7 SHA-256: 66f84a8ed5d5ac87dc83d8a1bec7e39285f95a910cb6aa4381e3334ab3232bfc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to potentially compromised websites, suggesting a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics indicates an attempt to obscure the final destination or spread malicious links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=minecraft+electroblob%2527s+wizardry PDF link annotation
    • https://defaico.com/d/files/13974021279.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/67366401179.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/xenonirokapimunuduvom.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/mi6fuci9ard7484b984b6oka98/dumovejulategipator.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbc91c778---72063602048.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/xogafotowumagegexukajita.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d59fb28424d132369c44ae1a0e5e270f/4009593717.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb69fdc47d---poradasonid.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/fuvado.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/8755328985.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/g3m458aj0je90k5ku99ceefij3/divozuvolamo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6aeae7600---16618763366.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0c8557d331dc6121519e5cd4567b041f/vewewemozo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8365d1934c5fd68f7a300754aba9b6e8/57801306691.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tbpe9lian17ebfi0apn7oed377/wolazotimimogewe.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497704d6fc---40806777430.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/jagutenovixutad.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092252d38818---60709467040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 4744 bytes
SHA-256: 2e5adea36ef11485050080466905e68157534a6708aac15a9123194bc7d802ef
font_01_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 5440 bytes
SHA-256: d5391525a7bb37a7e1005b7a0cde780a363beaf7780a4b614790bc6f8e97cd48
font_02_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 11820 bytes
SHA-256: 277a49c6b86a6161075440d7c42422db512d13d13332b1a773bdf8cd605499b5

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