Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c974a07defbccf…

MALICIOUS

PDF

77.1 KB Created: 2021-06-16 01:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 188ad62796770a7fc9ab771fffe741b4 SHA-1: 383ed7698c18081de24f830845268f6c3d2a44d4 SHA-256: 41c974a07defbccf057c932ed12bf7815c2dcae2184e7adda04a6f9fac7bbb12
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to various compromised WordPress sites and other domains, likely to download further malicious payloads. The document's content, though heavily obfuscated, suggests a lure related to PDF manipulation, which is a common tactic for phishing and malware distribution.

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://philabc.ru/uplcv?utm_term=split+pdf+into+two+parts PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c3835c94---fexupurodogutajorixad.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mqp69t66vafugimjp9b5c4lu4g/fikolodalubijiluri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9cb732aee---37545756575.pdfIn PDF document text
    • https://activepymes.com/pub/file/kajunuzogusamuded.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/abaa9b16cf3e9adf2e00128d6e2ff885/kedagadagijawulevevu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/faf5d65168decbe6324e5173df8c8316/12677095986.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/45837564938.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/lt7lfck2ilc4vr7bdmp7v65uif/puxakadu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/79bac0e9fd70157e8846ad24cd3b17e8/80240683312.pdfIn PDF document text
    • http://fruitvita.com/files/files/92345989536.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4eb5b71b30c8554a44c8cec5d5caa199/foxuzinasaw.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210616004522_7vs915.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/26414906135.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/79457914602.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_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 5232 bytes
SHA-256: f17642fd8cd3eb85153068572400a8d9776b25f0bee1c41042706cdeaaddd93f
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 11828 bytes
SHA-256: a1d0599cb51afc4e587fcd6d10a2825683347d95a778230760cb5260fa74d1f2

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