Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bec606894c4020…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 04:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 079f249b99328fe2a9d040eeb3c34195 SHA-1: 8b3f7f5edfee8b954e308e8942dc7ac4ac0b1f9a SHA-256: 68bec606894c40209c04d00b84429ac4318f26da89fe9d292abf7be958cf18f1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or redirection scheme. The PDF likely exploits a vulnerability to redirect the user to these compromised sites, which could host further malicious content or attempt credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8b77b4a89e79b9f26162e2acef0c2dcf/26311941866.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fca2acefc2d---27766234363.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/55483136203.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8ba5cedee---89936933717.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/pexenofekes.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/38891339684.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/c51tncosk05ol5tgot19p3ocmt/matukikabijixadokazuno.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e8fd326208b975af549483b0664224cd/tulijefazumida.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/95982509130.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/96473916727.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/4985652681.pdfIn PDF document text
    • http://haai.org/upload/file/10220972376.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/70218008529.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/88008503076.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/doruxasizuloxepawo.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/nimomasawexivotifilobebib.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/32025583585.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/masosobeg.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ebe94dde372813adfa376d31938f4b2f/38590870870.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/tufat.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/54996661279.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/wibuduma.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95aa43f90---kebovenuxedadovutuzugo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c23baece3fa---buxujiwonudomidot.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/87890361983.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429142548117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=anarchism+or+socialism+pdfPDF 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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 17420 bytes
SHA-256: eccc7c09f119b70344b38f9e069d583d5f7a936ae71460155e88e34f354dfe15
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 10636 bytes
SHA-256: 3263919e7d111bf65f043577b4f1eae2a7397257e1988ea7cd65a73fc02e15f3

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