Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36b54b51938a22d…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 13:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80f03dcc805cf2f5169c2738a0b04032 SHA-1: 44e8cb9374cd47f825cf8380a1e47d76fc058fd3 SHA-256: f36b54b51938a22d5af4c46115a0505eefa2a5728fd17714828b1df4dda92ad8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, specifically within the super-forms plugin's upload directory, suggesting a phishing or malware distribution lure. The PDF itself appears to be a link farm designed to redirect users to these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/01cbbc27d6fd4cfb1c10f79a8d0ffeaa/gevow.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vgfs72dggq2v74r7jtf5sq1h7e/ropupikizumako.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/sonegufejitamomewep.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b794fd1e5e7---pebirok.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/cskp76moq4kunpq7mpji76hdtv/punogewikuzesoxikibume.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/29835b51bf76fd6fe508d519a21c8cf8/92648211719.pdf
    • http://bafiti.com/sklep/userfiles/file/81247582392.pdf
    • https://deltaguvenlik.net/userfiles/file/ditevajogoxuliduguputo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/438npq8q795647fbghgbqaqpm3/vubotobopamejupaf.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4715281de37e02fc6bd4dc4bf7453a70/45887765898.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5dcc64951---63286444108.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160913e868d23a---84249970669.pdf
    • http://indago-rovigo.it/userfiles/files/kuzewipope.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4b62a4dd---pazulu.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31a84cbf13---59392471556.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a597021eb1463d82661f8747371c1bcc/42540522038.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a002594d438c889fccda6a3bbab6f1fb/nidusafun.pdf
    • http://tiwtactic.com/userfiles/files/76997972044.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a074b3477---sozinalunaseniserujun.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/803f0b062aa74da396569287f8802b9f/guvejexewafokuwif.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/sipepinonezezupazizepus.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/19443177012.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9m4pgrab8je0mq72k9g6ehgalr/foxemodusum.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d6cc15808ff6bbcffd57d4e49f9a76ab/pidivuwej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=anyway+the+paradoxical+commandments+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_off0000fe46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16792 bytes
font_01_sfnt_off0001165d.bin
ce2e89f95da934f86788e654941fbaac2a6b68cd1532044759e8d3ca4d4a48c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 11168 bytes
font_02_sfnt_off00013059.bin
21850e79cee5ec3ef2542c1099940b2e95258fcdc07df660b1fe16811150e0c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 17384 bytes

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