Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8c14fae5fb3250…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 14:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a56692fecf7cf011a960f8b0b2b57f87 SHA-1: 9e93302226194b75e5eb28bdc61a5c2b225bd6a3 SHA-256: 4d8c14fae5fb32502be6dda5b87ef430cc46db06e847ce2574adcfe52af66ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs hosted on potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pokebarslo.com/uploads/files/tibibe.pdf
    • http://laihoawedding.com/app/webroot/upload/files/88361435518.pdf
    • http://wadirumshootingstars.com/userfiles/file///66326819779.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160967382b5e2f---moxuzijewanezu.pdf
    • http://recviem.ru/img/upload/mexaxilados.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/192ee9792bdebab748935b77f58f559d/23939168111.pdf
    • https://coluer.ir/documents/file/55854150414.pdf
    • http://mamam.by/upload/File/file/87536692548.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9f7346f5c70c42173d38a0f6c41538f0/41970472204.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19d423d1a2---fudasipixunoraxukubimi.pdf
    • https://zlatartopalovic.rs//files/37572955449.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad129d9f2e6---51533144433.pdf
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/kufelunuvinurexes.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/14793799313.pdf
    • https://niboparis.com/upload/fckeditor/files/73824060073.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34d4cedb---xegoxe.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a70963a2bda35e425cc2aaad7f0e30ab/65355896251.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21409571396.pdf
    • https://aimara-bg.com/userfiles/file/ranidi.pdf
    • http://bluedevils59.com/clients/862365/File/xujirepaguj.pdf
    • https://rosettes.it/userfiles/file/duzax.pdf
    • https://jagamimpi.com/contents//files/wamitudoxifuna.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f8189488b49378fdd3a8a7caaba0d766/17159876503.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2b2a1e4c1---sejefazeparalepuzotu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nmu+result+pdf+file
    • 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_off0000cc7e.bin
4f19e90d2d838e14918b4d71a1be75bab54d2cc61dd427ffd9bec2a07bb1160c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 10352 bytes
font_01_sfnt_off0000e3d2.bin
b9de7e668318e97df3c6635e43f07da20129abece237b3ab5eab0e6338a8d316
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 18712 bytes
font_02_sfnt_off00011343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 16792 bytes