Malicious PDF — malware analysis report

Static analysis result for SHA-256 655351f6c6e7ba83…

MALICIOUS

PDF

83.3 KB Created: 2021-06-27 01:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2d72f33c4925d324ca29450ea601eb2c SHA-1: e5d53e56e81cfb2d2c4d7bf45b3dc354f30d2116 SHA-256: 655351f6c6e7ba835ee5241be576d8c37388d9fd1470489456831673f9ce8f20
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further exploits. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://perles-del-beya.com/userfiles/file/xizirakilonamuvomet.pdf In PDF document text
    • http://songhandiban.com/uploadfile/file/2021062307263773499.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160900f14deca5---pipuzafopasozefevibil.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/rimisesawikapixo.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/30911200588.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc9fa2303833d795e1ff7a714645820e/zixarez.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/42412148896.pdfIn PDF document text
    • http://aplus.to/userfiles/file/97845763327.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/janowesemimiwibutaviru.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8d6c95bb21d978ddbf82390cabc7fc69/33053680967.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089cfff28e43---nowawefirabigofumadisem.pdfIn PDF document text
    • http://jp-cable.com/d/files/34381185513.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607077bee3109---roduligomate.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/92003393774.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/weritovilolisisuret.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/24236469014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=english+one+word+sentencePDF 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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 17208 bytes
SHA-256: d36278ada141e9c1b67a777e4e01710e8941cfcd72c03f991aa1731020062f22
font_01_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 10556 bytes
SHA-256: dde1bbaf9014f46603566162d4e2a4b33cdb3dc52495d9542acac0a58e62bfb4