Malicious PDF — malware analysis report

Static analysis result for SHA-256 82379832e0834b71…

MALICIOUS

PDF

70.9 KB Created: 2021-07-06 06:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 190f09968c1d63dcf6f9cb7acfa9a29f SHA-1: 12e9464ed12a98aa1cc525e1f11d9690370c4781 SHA-256: 82379832e0834b7191ba3ad8ced59b2c4576890a35b83fbbbaa4ad678bae2cdd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The primary function appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/p4hgeqvkf26qll5mj6m39p70is/ripebarugovipixikitub.pdf In PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/zejuto.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf69aea497765d6cf7fede3c413ea127/64405480659.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/41124778001.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6794c8088019dc5dbaa0cd481f21e4b4/5365291010.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3d77430936036068f99c1913d88555c4/54005853591.pdfIn PDF document text
    • http://flexa.cz/docs/file/jarunuvaxusug.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zitasobedoletujodigega.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/31859851108.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadunim.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9912afc1---783074336.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7e1087fb---52256526997.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/suogpn0unk1d61472ij0frp6p8/nuwezexeguwaligogu.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/11394987378.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee101105f---68261267979.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/gavokojirapani.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/tuvemodapapatiwonepu.pdfIn PDF document text
    • https://tsegypt.com/file/71812634031.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ea77b80fc1c029109266614bdb5b09b4/71027609966.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/gopifebidejadisanol.pdfIn PDF document text
    • http://e-sportis.com/images/upload/29387456067.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/botujugenivijipex.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/29687316671.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/673746b741b0ea47dda3d49dd6d7e152/56071472214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=partition+carol+of+the+bells+pianoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 15584 bytes
SHA-256: 7020107224dc2c4e567ba7e78fc6d7ebcdc9cdaf308ab4c9d659613353ef8f75
font_02_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 10716 bytes
SHA-256: 9650ce5eda8dec72f90e888e745dc1cf204e746bd33c38f602b2ef9ab21f43a4