Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94a270f057cf16b…

MALICIOUS

PDF

74.4 KB Created: 2021-06-21 00:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cf412b508dde619a97dfa55e67f516b4 SHA-1: 466c9673504be4650c94a70252236482bade1bd4 SHA-256: a94a270f057cf16bd54bd7270fe7ec65ab15d63f9d1e36454528d9b86b12db13
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various PDF files hosted on compromised CMS uploads. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malicious content or conduct phishing operations.

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 http://toyteepee.com/uploadfiles/file/210607203011920943lwx9u5.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607894589be88---28806882059.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91f1c27b9---17344169920.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/60da63115d09968f2e3194c2b250564b/tafozuroxuzixawologalu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f400399d3510e24458a4d3ae98583a87/wenesoxevuposujupokomenen.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9584cb45---jamili.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/vitode.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1a23aa70---nezegodugaroxuti.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/sidepuvagigexudi.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bugiluvixiput.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o82gb5bp6m5cn166fn0puhis30/74038307166.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/rulabunasuse.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb79b173aa---gewibemutulinexak.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cd300227---72159582340.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/didexama.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vexawunafaritabodefumena.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/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=twilight+breaking+dawn+part+2+watch+online+123moviesPDF 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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 6140 bytes
SHA-256: a57cd114561ebfe5dfdf06cc6fb733ccb6f06a56fb95f155d147b66c80aa6306
font_01_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 10952 bytes
SHA-256: 3d166f4a1d5873ba0459fa160b2da1e10afc622a42d807e16f6b37707c419dc4