Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eab92852a38e891…

MALICIOUS

PDF

116.7 KB Created: 2021-06-28 04:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd40f5a53c7c2bf324f7f4f9769fae06 SHA-1: 14bb613c037777b1f3e3f10672f8bfe1941390f9 SHA-256: 3eab92852a38e891a408ad14fb9da9054b79be735e1a059b5ec48b271caeb8ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/1j0qj4qtmkq1kf3ku13ki4pfgl/madogeloga.pdf
    • https://noihoithanhtuan.com/media/ftp/file/gaxebar.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be08a20a6---botivuradit.pdf
    • http://amandatravel.com/userfiles/file/42568089280.pdf
    • http://softwarefactory.nl/images/file/16852601656.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e839a44a9d---ninuna.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ac57a1abdd8162d854b33f89f95ceb45/kotidurowuju.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088eadd95ef2---vakujisepubigidub.pdf
    • https://talleresimad.com/images/subidas/files/sokaxowegituwaw.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573c4ce640---51018706533.pdf
    • https://infoenergie-loire.org/userfiles/file/51070856699.pdf
    • https://paklya.su/design/img/upload/file/86618510715.pdf
    • http://msamerica.net/clients/873634/File/salosupakafuwajesaf.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b7c31ce02199d1fc109829df935fd052/timetuninigitatom.pdf
    • http://baraanduliaptti.org/userfiles/file/14920196649.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2abb67bcc---90953899686.pdf
    • http://londonjip.com/userData/board/file/28086488785.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e3b44e334316acbee78857146178d031/66533996347.pdf
    • http://humanitool.ru/userfiles/file/wumozinakudisu.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c552a72baeb2db0d8e0160c848e46587/45696758229.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160795e8531712---6216404582.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8210b33d6a6dab9cd7a2bf54bb2b80ba/rosivopunokimumakej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adjectives+for+sword
    • 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_off00016715.bin
fac177ac27c605f300c1354829d0f933c4c45cf01104d02ddf4db067ca98709f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16715 18060 bytes
font_01_sfnt_off000195cb.bin
f7d25074bc4cb9b6e21c7c229e69b6c4afccd54445d5e055b0935e95b177c77a
pdf-font-stream PDF embedded font (sfnt) at offset 0x195CB 10420 bytes
font_02_sfnt_off0001ad8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD8E 16792 bytes