Malicious PDF — malware analysis report

Static analysis result for SHA-256 2592f4d05b70e1ea…

MALICIOUS

PDF

90.2 KB Created: 2021-07-19 05:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afe65c4e2838224c0d2935983c6d1aa5 SHA-1: 7abe3afb12d959879a15f39f4d9533f693f72798 SHA-256: 2592f4d05b70e1ea0a27b4c3147864dee89cecb5d6ad65b5407ebb796456ecf6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ad186f54df04438fb5542935372e7688/fipiroguvogijamam.pdf
    • http://hasyo.net/files/file/81168888483.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627150132.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tomewobuxege.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3b3ad7b7---43906238099.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g20tokvf7r4nia7kgr0h7hhir3/puziferogu.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3da161e7e---retonipep.pdf
    • http://savaksangida.com/resimler/files/kulezato.pdf
    • http://poorclarescork.ie/images/8136139304.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af356d0bf98---waxivi.pdf
    • http://haiphongcontest.com/images/files/visebatomovepenojodaku.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7b1e4636---69486030508.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cffba90507---gifimizosamotomuguf.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/504919f9fd58558c485018bc61f0685e/50760873470.pdf
    • http://studiodrago.eu/userfiles/files/forag.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/58655958265.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fcd972ab9---doguvesojasejev.pdf
    • http://eaas-journal.org/survey/userfiles/files/jureziledez.pdf
    • https://mobilieroccasion.fr/uploads/file/wamid.pdf
    • http://morgancountyoh.com/userimages/31814132498.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/77355046163.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a1b3863cf---piseradapaposexomopawuwos.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607112f9e3015---baximelomudurivebe.pdf
    • https://kopari.hu/files/file/gogogep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+devil+and+daniel+mouse+1978
    • 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_off0000fdf2.bin
96aae5ed1d95366ffc0e8f4c2cd3a5dffb36480a6829197c97bec2600f989ee6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 10920 bytes
font_01_sfnt_off0001171e.bin
89dc6a551f445c8119b4ad81be43e261756bb9b780d69f29b7366539cff61ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 17020 bytes
font_02_sfnt_off0001438f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1438F 16792 bytes