Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eccca0fa0d269b3…

MALICIOUS

PDF

95.2 KB Created: 2021-07-27 22:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8ef6fccf1ba09f07e37fe9978526cf4a SHA-1: 953c38b1b5b0643ebfdf235712a0c859b71b3ce0 SHA-256: 8eccca0fa0d269b3d13afb20d1c8d3c4ded5eb4ec4f5e3d7520a2dc37d934a47
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paperland.bg/uploads/file/13315867844.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210509185315.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dkueoe1ne5ccn4qnf1vqeff4fc/wekaxodivavokatovafitaziv.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/feperakexoraxizo.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e34a694a---73624068955.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/javulajininudagus.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2501ced09a32e091b5dbac28286f584c/fotibufo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/60f6109a24a97187bd63836e4a8aca76/8483912743.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eeeededee---gowurisosumakoxefivujasow.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0f45683595bac8af9cdac0d39492bfbc/darakurirudag.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/kexin.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/8vc0kq7ubuge9lnmog79egjns3/40736054045.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fda47bf00095698f5de479c26624c239/12756593943.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/47892710636.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb36b6b57---zobezokanej.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/22rraioe8f3s9v4arm2en51d26/lipofokutit.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/jesobepekubatipavorawubu.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/vufete.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/74067845233.pdfIn PDF document text
    • http://adveotec.com/img/file/26684275668.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609233735cd4e---96802907861.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/21189443382.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2e3aade8---26139623661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=full+hd+bollywood+movies+download+1080p+mkvPDF 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_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 17512 bytes
SHA-256: 58943e0e5b6e79b5c6783c629d3563bf15768c5f300c2fd93236b319eacd80f3
font_01_sfnt_off00013b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B41 11416 bytes
SHA-256: 1b3f87520fe0abffd433368a619a26f3e559217884fd8451fb2a33baa66c888a
font_02_sfnt_off000155d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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