Malicious PDF — malware analysis report

Static analysis result for SHA-256 9829c35654d681da…

MALICIOUS

PDF

108.6 KB Created: 2021-07-13 18:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7372e37e09f496f87fcbef6e69d12914 SHA-1: 407c93501176340e4e18b57cb75808745ec913b5 SHA-256: 9829c35654d681da131aa3cbc8af55f24fa5e195556a6a60053cf9442e31025a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://www.advokat.com/app/webroot/img/fck/file/tusatef.pdf In PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0c61e0ce---55278063720.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d2hknsrerlen6aursdjhq9b8lj/xogolo.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/69826438811.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/72517143904.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/musanesese.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8c4a80778879f0c63030647a54203057/82723742270.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/jujofegegel.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ea3a580dc41b57e0a0078583deb1a2be/53189608638.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095520a5ecdd---79430754262.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a840198c2fc---99723015183.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/47391364063.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/32766128554.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9a2710e8ccd19aed4f24ee77ea51e9c9/juvekigeradarixofelimi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6697244005604279f8bd5132b326697d/wofozubamobodo.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/4069020366.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be9b759871e---4427875546.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/niseduvezobesijobokerele.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/23438090779.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/32d1ecd8c469c9623f77df93d046c546/loxizuxab.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab915157c5a---67249669877.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/7051420237.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/34399ca1b8341dd53bd2df1b016c4769/dizudopawevarixuduzowe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b390023de---88119125164.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/45678168962.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/ruzogupazesukuzoxefurar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chip+n+dales+rescue+rangersPDF 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_off0001444e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 17752 bytes
SHA-256: de785700452dd163bc3bd073ba3dd28e706c90b68f7f73b9b024a5546afa2c6a
font_01_sfnt_off000172fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B13 10708 bytes
SHA-256: 2dca275fcd0aff826fc1735f42df7537571ac923d6ce32249c07d4ab91d371c9