Malicious PDF — malware analysis report

Static analysis result for SHA-256 e944b87af68e2c06…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 19:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29d122cc0e5dcaa663fba426b8a92f1e SHA-1: 57cde512a9a45640d21240d8cb4b391f249fc9ba SHA-256: e944b87af68e2c0642d7004492d5e569943994187f679a55a0999450ea4dbba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious intent. No scripts were extracted, but the structure and URL patterns indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://ebsenglish.net/_UploadFile/Images/file/xiwarezosalijidode.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b2630e575a8b31a61924f7587a4dc50b/12561768785.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/13e8c342db0f6b38f9b091fc0c8e14f2/5772143254.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fd8248732537235dbaeafc0306b13377/55801996862.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb4736cbc---werewirufezoluruniladofop.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r1gkhlcn2ahee8hvv5hue2ihd8/23175970940.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1405d2c98---jegoxavadelaramesidelakom.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f013f274971d16669569e568d4e1a8d0/77694861246.pdf
    • http://smartarts.bg/userfiles/file/60586728801.pdf
    • http://meteosputnik.ru/userfiles/file/kewuv.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b95c40b21---jesula.pdf
    • https://hissekurban.com/resimler/files/61487221477.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c6cb1041f---jikuxanaruvusegub.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f44e10f2939189e5c9c296ab997adca5/loleziriradejixefokakagel.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5tg1rl7ubhv4akt065488r2a46/44898293966.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/srvb2ukumk2oh6u1i2ospl6pl3/24270739333.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ca5a202d---mazepexawik.pdf
    • http://drivingschool-brno.eu/files/95008615612.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1ab72016608fca8fa32d1f518b8f2fdd/surejuposokan.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed278bee7d726d31cbd4a0606322b86a/jezik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=find+center+and+radius+of+circle+from+equation
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e100.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 16792 bytes
font_01_sfnt_off0000f917.bin
b5d3eb90a696d92717ee2c32eafb86ff12fdbca300b1f2b68c367ba296306b91
pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 10860 bytes
font_02_sfnt_off000111e9.bin
ef1b471ddd7baeb5d9c21cd521eaf4b16cb8b6d640d48d0fbd172aeff0916145
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 17752 bytes