Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8694ee61e58d5a…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 01:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 943c15fc406af3a718ed64de315b4036 SHA-1: e4c8a46643faa7e7389a87f035e5fe18dce25916 SHA-256: 4b8694ee61e58d5a35612bfb224b3176b48c7dc15ab9bb1227f96a9fc8c1b317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting an attempt to leverage these for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure suggests a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rivaflo-south.in/userfiles/files/xolomujiwi.pdf
    • http://abwpetersburg.com/uploads/files/23046783316.pdf
    • https://flyingfish-stay.com/userfiles/file/15004288581.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/37947420724.pdf
    • http://accessiblevehicleservices.com/userfiles/file/sowodenefazizizag.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810152ca4bb---13725377818.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0e50bce5cf0683abef1b6d29b95b6757/55400171976.pdf
    • https://adepotcustom.com/UploadFiles/file/20210504070752116.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a835dd29c56---dugixupajuxadedolisebuvu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b09e165b---degemitonemiguruvu.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b7d8781dd788e10c3381a21932da7430/25132660364.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089685873f98---guxedukine.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b615aa9bc7e---2740409642.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3655e3caf---62767426708.pdf
    • https://aravlicraft.com/cmsCart//upload/file/47509004287.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3bf59e28e80fbc8dec1d664ca62d0ee8/mozifo.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/heift1f0om0uvg6jq2lb4k044a/43113925781.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607552713b522---49873431581.pdf
    • http://kapelski.pl/userfiles/file/befinowimaveporaruvokog.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/39051495327.pdf
    • http://murphysbeads.com/clients/54316/File/rutowob.pdf
    • https://yalcinplayer.com/calisma2/files/uploads/defivuxofisudokovonupap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=top+riddles+for+kids
    • 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_off000100df.bin
753cd50a6811b663804bdbba60ee155d24426e137115f231e75554ffaed28ffa
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 16712 bytes
font_01_sfnt_off00012c3e.bin
fc0349bcf05118b00a11e72c9df49a7ec7d05c1c5757531f34862658e5b823d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 10180 bytes
font_02_sfnt_off0001431c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1431C 16792 bytes