Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dfb4e892000b27…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 20:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a40e2c17fb409d5ac828f4e19381d896 SHA-1: 5c61104966021810e01d3a02fdc919e0e73a0c3e SHA-256: a8dfb4e892000b27d2a68342242948821bdebc0b9dcc1e6364f6973a84d058b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content, aligning with T1566.001 (Spearphishing Attachment).

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 https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/27a1re5r1l9smo7nbh75vkqog4/52839767587.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c39f41a534dc0b33f9c607a1cfa410b2/95427369058.pdf
    • http://firanywiktoria.pl/uploads/editor/file/60181056391.pdf
    • https://mavibusiness.it/file/gijofifebizokotapopig.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/17be53d9480f2bca133f2b54e8f0b660/34017695331.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8ol90slqh9dije2ren4banird4/dikumuz.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/thqjf86emcusa6851tbcm2f99p/zutabapovesadomanagamib.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607001f0495ae---11933303756.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a4r9qh0l4ufs684m9jbt4u5c02/kogerobup.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/tezasapuba.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3e47bc31af5366b72314cc853c5bc62b/misakinomifilusine.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855bc55c7b---folixasikim.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb579ef69---25644075154.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7bfc35de6---zuvapovujitiwurabajir.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e5069ea8---87807503936.pdf
    • http://aostavet.it/userfiles/files/padoxutubegobalaxe.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825d710921---92014703562.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37bb398a5---diselijujuvaturewi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865bb0f2786---31167365246.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/latagup.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc6bd2be8---58753399654.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b9c8obj4ejen2n5rvjeesmi8e6/61762722272.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+jack+of+all+trades+meaning
    • 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_off0000ecd1.bin
bc1066612506d2710a036b06c1395ca251bd74cce5e356adfcdd929be433ab0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 20192 bytes
font_01_sfnt_off00011fa2.bin
9df36812b9879531d9540467ea17b22a77f57f045d769529c935b7fc43dbd8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 11108 bytes
font_02_sfnt_off0001392f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1392F 16792 bytes

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