Malicious PDF — malware analysis report

Static analysis result for SHA-256 72449dae955c73db…

MALICIOUS

PDF

61.6 KB Created: 2021-06-19 17:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ce609ff65394f4fbf56c57072845fcd SHA-1: 22cda5cd85eda057c39b2808c3448ac3b0abf86f SHA-256: 72449dae955c73dbf8881cf2c0b770e4afc8fa0797710e33b3466aff1978af47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/pfcg7gg2phtftnhn16e606q1i4/17851173751.pdf
    • http://vds-construct.pl/userfiles/file/91953213434.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5911c0b2f---jogamem.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/193d6c3edb253edddc9a8c34ef9ecbdd/65329490149.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70ed1da1f4---jufoteditigolis.pdf
    • https://parfumzone.ro/files/file/zituxevokomadeg.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079956adaa07---802603146.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/12use1cnupcgplimb0ici0qmr4/xupizipi.pdf
    • http://garantc.ru/userfiles/file/sazakuwopitov.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b7fpvnt87mehnnfdfti8pia7jo/wiwunekerusosi.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb4902b89---18722166460.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/255c37c7e95c715d3a7ba13db1683db7/41242164774.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5942dd5c---vasesexerakas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=linear+integrated+circuits+ramakant+gayakwad+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b161.bin
a5ead37f3c704c7e209d5a0154372a014bb04da0c7a7896b2f609858313325a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 5644 bytes
font_01_sfnt_off0000c4ad.bin
1d083012a4a2ecb3836303e94f1ce5c3646c5ce14b2c848c6ff8b949819f24e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 10232 bytes

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