Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b1a1d0768c5810…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 11:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdcd11a376a4f68b683322e0457a2f0e SHA-1: 289ba27a8944289656ebcfd7720c441c6656b9f1 SHA-256: f5b1a1d0768c5810973f882944179748b7aa094d5d6332bccf7e74df78a9434c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=electrical+wiring+residential+19th+edition+chapter+1+answers
    • http://furniture83.com/upload/files/zujaxebudikutosuwabefu.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7892fa17367a760804ce60fa2df604ba/solaleviniwabobabosami.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d3308a563---tapalotonowanakurubasaxen.pdf
    • https://agronlogistics.com/userfiles/files/dexusoxigutaj.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/523ede8dbb751a6d557875f448e881d6/64289878898.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/5507002908.pdf
    • https://ph2020.org/FCKeditor/file/getajaredubowababa.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c265171022---difemanepud.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/dezutepekovugiwubaf.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cc884665f541f4844e55dc3be541544/28687116581.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bjsf988jbfs6kdoefq6ohq4tj7/senuzizugudujivuwolaxa.pdf
    • http://deauville.ru/files/file/xizolagifejive.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ab9e412d---56906486871.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608168e5279ae---9311495117.pdf
    • https://b2cexpressdemo.com/userfiles/file/zewonujogo.pdf
    • http://anatolianlgs.com/userfiles/file/955503193.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ffcjsjfhpbkkk1f3na5g9q958d/46929836632.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4f5914c648c60dade189a8355c4c33b4/45119952118.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/c70672f77dad2fcdf1c541c8bb5800f7/supozu.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3561a3b65---74392680558.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf00d1873---32870114470.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/u0q4jeknosui9bvo8rugr0h4sg/vowefonexexewozuwisik.pdf
    • http://rts-3.ru/upload/files/12842942009.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f86473b76---45088179115.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_off0000ea53.bin
f4e5d923577a0e80d9386960c6dd5ede0743064a0f52a2dac811e2dc134bd9d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 11084 bytes
font_01_sfnt_off00010404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
font_02_sfnt_off00011c16.bin
16e82fbf52e0081699bf2919c671b3825a6d01893543e0bc9ec0038be2576835
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16600 bytes