Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b1f128dea317cf…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 08:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80164dc4a7e97982ec31386e7aecd030 SHA-1: 5c4073e1f5bc56edebd7ea2c19e9722aedaf1acd SHA-256: a6b1f128dea317cf9680b58b0913678694a53fd424f7e9106f628c7a39e98da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress upload storage locations and other unknown domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6f0d6b3c---porovavuw.pdf
    • http://abwcockeysville.com/uploads/files/6483036882.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3f85c157---jomopoludedotovopusovel.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffeb2b224a---ridowovoduwajumeguxisavex.pdf
    • http://www.darvidproperty.com/news/file/xevipanomo.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a4e1d0a8---gukiluzenulemusamiluzuru.pdf
    • http://portalkucharski.pl/app/webroot/media/files/54613958525.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/70254412427.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3abc58c53---vuputedomasilajogixokotom.pdf
    • https://sindonis.com/userfiles/file/ravejoxogajixalosafufafud.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a024456c41---rivafogujifosijopegisumi.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hs4as7e42r6n2i9m2vam8gmhn1/sonijo.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/thv0ig6ubk0g3ctvva5q2on405/69246013335.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19079e04d6---85925591896.pdf
    • http://kstarsmall.net/userfiles/file///50911655831.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd8c8ad4f---womoziwefumimapawiwojix.pdf
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/96119495545.pdf
    • http://bright-inter.com/file_media/file_image/file/78720152993.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067ba61a066---sujepirekivekofopuja.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0a4d052b956d1da739568d24e2e02a03/416060063.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763aa603ff8---jipoponowatalexexatazifej.pdf
    • https://demircanticaret.com/userfiles/file/relukubozodudifaz.pdf
    • https://n-v-v.dk/userfiles/file/78356070938.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sons+and+daughters+synonym
    • 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_off0000e98a.bin
433f12de5211305aa144856a0eb2e6daa3ed407dda41ad5f3e59c8aff7bcf1f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10848 bytes
font_01_sfnt_off00010233.bin
c6dcdb55f82b1216f99a358fc81bd0dded10d5b9a993d1e44d2758d28090f8cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 19692 bytes
font_02_sfnt_off0001353c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 16792 bytes