Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b526d32dc7c3d98…

MALICIOUS

PDF

74.7 KB Created: 2021-06-14 16:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bd689a6978bc3f144becd813822a88f0 SHA-1: 1559537ec7966932941c26ae4ab6ac44dccbe78f SHA-256: 7b526d32dc7c3d987ce9774465d15d8f34f10756f978aea131b62c4f8d3e9afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pistant.ru/uplcv?utm_term=wood+hardness+chart+pdf PDF link annotation
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c130c0ca---26402067500.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ad1650d3---53799956930.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd208f13ccbb78347d41384e0e400441/52936149514.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fd243309---92354301359.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/122e43becf5f1da651e70d421ae43188/laxosunaniwekewarux.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xesevonuki.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qerrcinbqua1h0udh8jepe4kat/96402016769.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3f6512e5---21231703439.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f11811570---64738643038.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ff4ffca87c81c4733375b24740ee9846/99407485003.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xiwomisagerajamenuzo.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wovibisij.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66417fc98---21244553187.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xugibidutimudesobulewafeg.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9313469b---zibobejivasolabuzebo.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/97894405753.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 5224 bytes
SHA-256: 0fc58f5ec019054106b33d72afdcb6cfdeaab9c064ebb08976cbb23fe79a84ad
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 11860 bytes
SHA-256: d7ad2ca30329e744572404f20ab3dbac598f03d29735941a10bbcb5ff965f992