Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6918c2cc1ee0ff5…

MALICIOUS

PDF

131.2 KB Created: 2021-07-02 23:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a2966ed01f8f78931f3504fa4af794e SHA-1: cacf66ab960fd1351d882eaddc359bbd43eded43 SHA-256: f6918c2cc1ee0ff56aa4938a96cfa6430e707bb3ab016d7b31ab913d532aecd6
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the heuristic firings clearly identify the file's function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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 http://interstyle.org/content/xuploadimages/file/59031124525.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0247a7834---zazilajipitanezalileva.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89f781f2e4---xobifimubelarewukovogiz.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/39f7673119b4a367e1c2c1c8e5b7244f/59562111309.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ibs2hqkovj25e0c4msr6opkqo3/mugitogenuna.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f956aaef5---zifotozajekolepuna.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b17793be88a---43451387627.pdf
    • http://irk-yoga.ru/upload/files/87438389330.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a59bcc72f97a08460e9d228eb8e7becf/95068151298.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076436e7f66d---xazemobazukokedadip.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/b991jdnss04gf6s1sp1r5hhlg9/dupubokorasofi.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f2053fad91fac7d0d6c4a2700cea7e26/38429672779.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/t72v7mb2q6oiai2n23i1306af3bfv7pb/29626376533.pdf
    • https://tatsolarlight.com/uploads/files/69316271798.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0c81e68ac7a28bc8b91f456ad7f4c847/padalizedifesadopomura.pdf
    • http://voxel-avocats.fr/uploads/file/9880139684.pdf
    • https://mimpiindah2.com/contents//files/2324462387.pdf
    • https://pasarangroup1.com/contents//files/vixenonatevokafewosab.pdf
    • http://hzqzg.com/d/files/44363284079.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/79754103777.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a010c86f946---tudenefuxop.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a5afrifb4pp9pa0o8hr608pdru/boteti.pdf
    • http://hurtglass.pl/upload/file/71230959495.pdf
    • https://fablab808.com/nbloom/fckuploads/file/dajadaxulutuwu.pdf
    • https://cjsc.se/ckfinder/userfiles/files/49979967084.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd19e7443---sibajisorev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=practical+conic+sections+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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018240.bin
31f56de24ac81a849629f151527d8f7c17fde5f53933b8cc1eee86a572fd4810
pdf-font-stream PDF embedded font (sfnt) at offset 0x18240 20504 bytes
font_01_sfnt_off0001b8a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A6 16792 bytes
font_02_sfnt_off0001d0bd.bin
27f4127d7117fa77f29f0f38305da35449c1834f7565f14501b80054bcb29cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0BD 10616 bytes
font_03_sfnt_off0001e90e.bin
7dd5fb61ea0ea1e3370d26720032e9d3de5740e898843eef2fe92164eee2597e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E90E 16224 bytes