Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd96a69bbd04403…

MALICIOUS

PDF

73.5 KB Created: 2021-06-19 19:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b2fd71dbee425d27b510f384f0420aa SHA-1: fcffb1487172a89109e38d262d168f2a1caf7622 SHA-256: 1fd96a69bbd04403f287f34660eb1fa79f7e8a0cd7f25301f388e0270137c5cd
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with multiple URLs pointing to compromised websites, likely intended to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://shipagents.nl/uploadfiles/file/62729388856.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cd018265---80396387436.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/71725219595.pdf
    • http://g-shocktou.com/user_file/file/5948176349.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/07c8b991b64cd1aeaa023877a1b9cc13/kobitejesonijufinora.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cae1ec788---xiwazubosel.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d779adefd927ac1da53ef4e76d8a6212/tewuwaw.pdf
    • https://latework.cz/soubory/8736048441.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2633ebc55f5e557f6752da6b4868afa3/sijokurumorenuf.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d782c32f77---40210947345.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076acc313c78---tatijabujafewit.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/844af51b589b89030d255328670ad125/99040139342.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bad8d247812196fcfe2ede616cf15daf/xilojepowimag.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759b592a4bf---33750937170.pdf
    • http://angelcabrera.com/FCKfiles/file/5238217782.pdf
    • http://sooclose.eu/upload/File/tosabawi.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8oe32a1vu0617qec7u46r1jdvh/42275429450.pdf
    • http://playbabydoll.com/userfiles/file/xodik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=doctor+appointment+letter+format
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b4.bin
f65ebe09757029018128a3a069704ee6dea4761699c6e65fd0d04da9aa2e7c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 4980 bytes
font_01_sfnt_off0000f99d.bin
2b2fab81a8060f251cbac5005cdd64494538ad1077729a97f153ac0060351dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 11308 bytes

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