Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a0a6a7413a1880…

MALICIOUS

PDF

83.9 KB Created: 2021-07-31 03:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1df2622d9e2d7fa1aac6b002ab7fa354 SHA-1: 1f528292a3bdaefc05a8611697f8d611a659a979 SHA-256: 28a0a6a7413a1880169565733272e1dc151c9d0ff03e8281f1362f6f0ca79676
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://faxik.ru/ckfinder/userfiles/files/84758937275.pdf
    • https://psychologgia.pl/Upload/file/55151740652.pdf
    • http://yongqingtech.com/d/files/4488831131.pdf
    • https://southafricapools.com/contents//files/togojisofarojeti.pdf
    • https://noddy.nu/images/file/wumigovozo.pdf
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/28632397423.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d3282cd97e0ee1688a439f99e2db0e13/27238433294.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a7307db7b26b6d917a3d7f652844ffe8/89903832527.pdf
    • https://olterus.net/contents//files/sidemakuwef.pdf
    • https://valve-toho.com/userfiles/file/vufose.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c83f1c77---sadiwasuj.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d229aed5c4081b912189cefc18622475/91410038560.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd74c3cef70---mufajupu.pdf
    • https://rmp-familienanzeigen.de/cms/files/89507112578.pdf
    • http://ventilatoryzlin.cz/images/file/25053047803.pdf
    • http://bularz-auto.pl/images/userfiles/file/28125808130.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098440ee6125---dimetesejetiluxodusow.pdf
    • https://netpage.info/userfiles/file/dosuxibaxilejuvurajewa.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/be1813713a57a3a21b41d885994f6d8c/nasipob.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6a5446af---libisut.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/149ml7gn78br903uvm7l7a5iqh/xuxuvexasirasugexiwig.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pu7ov0fvn2hm92a572dlcu4lvi/bumoruxuzejuzulosugix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=electronic+battleship+manual+2012
    • 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_off0000e484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16792 bytes
font_01_sfnt_off0000fc9b.bin
37d4a4d95db12496e1f5ffe4e8e979f178a3e27c6d20cb7ef9f74ede00fb88b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 11156 bytes
font_02_sfnt_off0001164c.bin
09bdb367c563abbf66adbdf9a10c76e0a606ee7ff6964fe883bd8c90cd5a41be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16888 bytes