Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44509689db8051e…

MALICIOUS

PDF

72.5 KB Created: 2021-07-09 07:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32521391882839d8b8f5b1852d38778b SHA-1: c0807eeb1e1780d3f775e1f37477fe0ffe96c315 SHA-256: c44509689db8051ec70e29e6b3c957e5078713b77b772bf682b7bd9b1d4c6c95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=visualforce+page+examples PDF link annotation
    • http://rainbowcaterers.in/userfiles/file/letadujumamumuja.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/98121048571.pdfIn PDF document text
    • https://luminex.pl/upload/file/nawigixus.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fa5388b0---ribeker.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/putajifozavifuro.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/00d7f94b6bfeaf9643dfffe3e51b697e/sogakutiworan.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/kufutexasipav.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e39b0486e---fixoxaweponasobo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8c7b3795---dodutiluxowutijibojukike.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c84e9174---46569490821.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7lilqo4qpd13cvrkeno9lm8417/23248224934.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4312b2b5be---ripapugikuluwu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/46spmqtp3n69v0nvlq3ei0tbc2/jojasukibatusigisejovogep.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6588f0bfcd---58287956094.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/1612232572.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/vevipik.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ab497ee88ece21765f20196b25e31bb4/78330287517.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3de7055f9---3354625610.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/wowajikokaduzetibixik.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c978b529faa---77147724085.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///rezolomapatatajupesip.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/904slf1ubkj0cfkq54qnbje1gi/gomol.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/fodepibukazinanonakoduwal.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/63368962883.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 15928 bytes
SHA-256: 2a6bbad8f601d0a79dd60a800b5ca91cdfe332161b60a7431529dfc01e24bf40
font_01_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10792 bytes
SHA-256: 8bc72a5ee89ab72c19699ef95a60d1047fb5413c808cbbdd7bc5398db8cd4df4

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