Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b12ba1e09b34656…

MALICIOUS

PDF

82.9 KB Created: 2021-07-16 17:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cb90e5823d5698fea8ae1235acbe494 SHA-1: d48389350483de161b5b6729045514607a0f187e SHA-256: 6b12ba1e09b3465655b63a2602194799507a74b99a58ae831500fc2d1e8456ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm that directs users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1739ccabbe---goxaxamarojivesa.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5f271be8---guzixibuviwukinimupir.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090bebebca85---kevemex.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c6f90e798ed67b715a8cdd92adcb1602/vepogidulutakodefovugemuf.pdf
    • http://thewellmanteam.com/userfiles/files/seropuzanevuxur.pdf
    • https://bruceleevideos.org/images/file/28615375292.pdf
    • http://momsystem.ru/public/file/bapajobamigopegokedaz.pdf
    • https://asset-books.com/userfiles/file/tosowolebifimilov.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074477ac83ce---mufabimefazodixejose.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4f676c6f378d7e758e20a4ca4cb2729e/wuvaxuwomiduxafafosumasoj.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a582f48a---63543457876.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gse8nn9sju2bm55a385ui37393/vijemolewolifozub.pdf
    • https://invest.pl/userfiles/file/bobobenizitaw.pdf
    • http://riversreunion.org/clients/8699/File/vunuxiziza.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0a403f65---8339840184.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f56f0a66d---63827708591.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdedd1670b0---kojabutasasewu.pdf
    • http://syuncyoku.jp/upload/file/banadito.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085b45b54fe7---lutepogipabevebozebi.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/542df558317d586c922da1a566b2d7a2/bekerubimu.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd793d4a465---zevagaben.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/45027ab5058a6fe3844ba9091e2e3077/nuzasumubapovowod.pdf
    • http://koronowskasm.pl/file/12066421770.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b169e6466b7---83901382568.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=scope+of+environmental+microbiology+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_off0000df80.bin
f571aeea9adead9caf4c993e87aa3dcccd1df22805acd66f5c082eeba8a04776
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 17068 bytes
font_01_sfnt_off00010c3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 16792 bytes
font_02_sfnt_off00012454.bin
e3a101b054303772935583e8e9936c47d8e6bbbdc582e595118e63d9248e2335
pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 11192 bytes