Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a140a43e57c877…

MALICIOUS

PDF

75.6 KB Created: 2021-07-06 23:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 173938c8ba1530ec82581523fdcabaf8 SHA-1: 82bf8d670de40001072787a2f315ed1f086ca0b3 SHA-256: e3a140a43e57c877ad212d488285875596ddbf3b54e35fcd6d61edc83439c799
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points towards an attempt to exploit user trust by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=mcq+on+cardiovascular+system+with+answers+pdf PDF link annotation
    • http://dienlanhlongan.com/upload/files/riwobekodigivisazutepagun.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5b3884eb8373f3cc4d547c852dbef80c/bokixapikalu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1ec293244d04fc45fc5c1effe2648833/peredodivafowar.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d4d3606---86428585693.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cd1cda87c025395173679cccfe9f566e/84319702300.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8d44182f190d7281727e34177205ce82/32858446256.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afebedb1c17---vovavij.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/94161664352.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb13443828---30917174151.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xebimebubig.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c2b5dcd6---74937768620.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/92639949049.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160871c38a576c---robafipamotutixeweb.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tesep.pdfIn PDF document text
    • https://nevisnews.com/userfiles/64524201135.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4a9a0a72a8e49459de6f1fbfc2b40449/bugumexodatijigumagisapek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/321f93fb723751725d0fa728a4087c41/24984511503.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/rafifibexuvutolobo.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/xajavet.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/gaparufofiso.pdfIn PDF document text
    • 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_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 11388 bytes
SHA-256: 68e7ff00ec74845bdfcc9c2829dbb55fcc1e99b32ba5d8e1d450ef7085f90ca9
font_02_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 16528 bytes
SHA-256: 48a96a8e9b1935d5b4f022856d84f5e51ef90982c1f43aa60213ac0811612a16

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