Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf504c78877a083…

MALICIOUS

PDF

79.5 KB Created: 2021-06-28 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5715c5dbdcb2b93c19cd24cec5921134 SHA-1: d5759321922b4f5d7a78e8500ddee81ff4b9cd7d SHA-256: bbf504c78877a08361f9c00e29a289b0deeccc6732301a2bc6f1faabb88bf979
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://summit-christian-academy.net/scauserfiles/files/90859266560.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875e9a30f9---pupowerifexe.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a0d97cf1---35226998163.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/9891019841.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/14285619697.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d086b37a6be---82790651989.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5d45abdd---53297040997.pdf
    • http://hugslock.com/app/webroot/img/files/filadonuj.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816e61add---88347252567.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798e45575d2---fifupizeteforodox.pdf
    • https://balajitutorial.com/admin/userfiles/file/xefekeduka.pdf
    • https://planet-for-events.de/userfiles/file/88141205361.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160772c2de16b8---15818499092.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bcf2d9da693e2d2652ecf8c11cf36b02/93383684006.pdf
    • https://przyklejki.pl/userfiles/jezaketiwukaru.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c8acfe5830821e9e092c1cb6535a116d/zelibavedopivutuvof.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/hrts9n25pcjqh6g2t5be20oum6/wotomobulujaxipas.pdf
    • http://manavpublicschool.org/manav/userfiles/file/43101736015.pdf
    • https://burgas-remonti.com/userfiles/file/menuridafetoniluvutiba.pdf
    • http://aaaexpressheating.com/userfiles/file/bufugumagidasuwomumal.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/18480076396.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xadelapavifakus.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/kj3hkpfjpbio7jslvlsg4q400b/wokujusezejapoba.pdf
    • https://people11people.gr/uploads/File/15027626517.pdf
    • http://msamerica.net/clients/873634/File/9313958972.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+people+carrier
    • 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_off0000d650.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 16792 bytes
font_01_sfnt_off0000ee62.bin
44fe3de4264dd7513ae855f4eec1c48dcea88c91ff1501c495d119170ed64a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 16552 bytes
font_02_sfnt_off0001195d.bin
91fde7252f45c39281156ebe008835fa3059f5ebe650095b3934564d25569ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 10316 bytes