Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac967a0687d9953…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 22:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa63b042c174eed366210ef6d7f4799e SHA-1: 31cfdf0b0e0d1a911617f94230ec9b633f9b3ee4 SHA-256: bac967a0687d9953e937061638278eb3b35827c82e0e27c34efd5142ca77254a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly suggest it's used in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://qlinairnv.be/userfiles/file/vivolijivi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8140928ce107ffd1606e4f04aee94ba0/59295800638.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf57a1ce9f---xadizaxuxa.pdf
    • http://connect-senior.ch/uploades/userfiles/file/kavodemetujite.pdf
    • https://armagedonspedycja.pl/files/file/zebipekona.pdf
    • http://www.hgbehringer.de/img/files/files/fanamudedibalokiboz.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s0a1t7ocp61234tpmcq8h9ib95/nezavemonabu.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/varuni.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b65c3420fb3c83a670eb71ac6b21fd2/75058665927.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c1750d81e---zopewa.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f399593b6d9bb4866f07d018063a3ffd/37026954134.pdf
    • https://mps-india.com/userfiles/files/80000731171.pdf
    • https://concertwristband.com/resimler/files/51675594205.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b7e8a8c4---napitiduzipapojoxew.pdf
    • http://lycee-elm.org/userfiles/file/73873758986.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a8910eca1da740d8837cdf528eb36172/wenorowaxeman.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609056614c1ce---75755746474.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6739a0add484b4e20b6b0aa3c7f31786/4136538827.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091188f241cf---futadodugipudol.pdf
    • http://fw-simple.com/uploads/files/10892768169.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/60496756031.pdf
    • http://www.aportecnica.com/imagenes/editor/file/siwaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=different+forms+of+nonverbal+communication
    • 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_off0000f849.bin
2e0e8b07a22ff8d610a67769456dd9044bbb88c101d473943f905a0e58413b29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 10804 bytes
font_01_sfnt_off0001113c.bin
8a01715a2658f8988e10518cdffbd77cb2e895a2c820a79a218b623d90f7f93b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 16744 bytes
font_02_sfnt_off00013ce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 16792 bytes