Malicious PDF — malware analysis report

Static analysis result for SHA-256 729f080183147122…

MALICIOUS

PDF

77.7 KB Created: 2021-06-27 09:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2676c2d6f21186a73aad9c451e07cc1b SHA-1: 162ec8ebca1fd33b26accabbde4601265c7939e1 SHA-256: 729f0801831471225fa71f30f553b0058e3a2ba3db2ff72de0faaa66e7457734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple URLs, many of which appear to be hosted on compromised WordPress sites. The primary purpose seems to be directing users to these external resources, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae1960dab---51578987334.pdf
    • http://say-international.eu/userfiles/file/vugaxakitijirusefumegavim.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f0c19e5e47732dda15fbbe8674939edb/49581444558.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ef1fgk1b2c2qe5ktlm8hf7lkb2/vupixubugeju.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c53596d7259b6d0ec5ec82532bdfda18/8762617548.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18c27e0361---26445052424.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6065613c94---mizimirurokewewaji.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c30bee90bbcca4e5f66f4cdefb166ad0/47288109526.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01831bd18---wosagewifepugifujum.pdf
    • https://amblamy.ee/upload/file/68637443482.pdf
    • https://evergreencans.com/userfiles/file/45460307974.pdf
    • http://arch-teh.com/pic/userfile/jivifakib.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd5b09f7c---54991432168.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9cac1efd---kabatiwirisubuladinisore.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/d7fbdtt5glg060j0tl7jp6c837/53636791275.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bff5b7eda---xekixafibejev.pdf
    • https://cottonweb.net/userfiles/file/vobigopidamepabido.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/88783120886.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4cb6759ea9883351df472ff25ddbfbe1/dugonowumojulusa.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/gemusazibaxuzikajakawava.pdf
    • http://christschoolblr.in/userfiles/file/jokigiwitejeninisopi.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p2ubub01dkfpn2rlbfkqifrb3a/tinajenuratajep.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fcb6588fa6f35f5745a500a4dc1e6f97/5126961763.pdf
    • http://clarksville.net/wysiwygfiles/file/48564023516.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+loom+of+language+by+frederick+bodmer+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb75.bin
3541faf2481b05099aa8c1e6e1dca696e61b8944309c920ca39f528cb7bb6d07
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB75 17104 bytes
font_01_sfnt_off0000f7cd.bin
2511b1604ca038d115c1a992db637937f0155a49f1d1930042a1af88ca6fad62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 11208 bytes
font_02_sfnt_off00011166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 16792 bytes