Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f6e3a3467c05fb…

MALICIOUS

PDF

77.1 KB Created: 2021-06-23 05:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a9a294e9144d2b1840c7dee519266d42 SHA-1: 69fddab75365da61aa306e13ca20174e4ccddb64 SHA-256: 93f6e3a3467c05fb5ca1d87248e26245a63f3367dc0689000cd6b4bf4e516178
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to numerous PDF files hosted on various domains, including one on a compromised WordPress upload directory. The document body contains garbled text, suggesting it's not intended for direct user consumption but rather to host links.

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 http://remproekt-m.ru/admin/ckfinder/userfiles/files/pofedigujatisuz.pdf In PDF document text
    • http://gyobel.itpublic/file/nedoriluvenifasura.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a816a31b690---5820760700.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/sugoxo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/75246595870.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/14000798313.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a48d5ad7d1777ab8b90e61ac46b610df/94759188014.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098392244651---fitoxan.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/98709917802.pdfIn PDF document text
    • http://healthywithhart.com/res/file/76879437450.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42c94cd3b---lofotufurunoles.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca323ccb91d---74777876649.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/godonugelisaxabegovinol.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210608052241107.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/legixizamadozalumidale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=beware+the+night+jessika+fleckPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 5424 bytes
SHA-256: 9d1d5382e06441f5d091f537f9e1a3caad0a242ff00a78d976411d6511d70152
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 11780 bytes
SHA-256: a23dd1df54162d003b67342bfe42ce45b58531a8f708f2f3f8743f1da9e78a64

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