Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed4d2a2bcdb82aa…

MALICIOUS

PDF

69.5 KB Created: 2021-06-06 03:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: de043096e4236b2416bbb822ad5c1f11 SHA-1: 99226adddcdf8a59557260d687bc60792485e198 SHA-256: 1ed4d2a2bcdb82aa71136945caeb796b95c2cec2f2d56310203672993359fa93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are typical of phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=the+elements+of+online+journalism+pdf PDF link annotation
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/53671757ca44080a2c0eb66d1f7d74a2/waguwikipavapufubole.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/gilagelomatugilawekomani.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608505a88ca52---tobofuvoxogenodezis.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/dhvdltnqr5ovruk1ra0jlr3472/87416418426.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f3ddb94030f58fed292e21b9256216de/lirixidukiso.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/79c314c96d65f3a9f2f4e67cd10c3078/zulodotenezaxatogu.pdfIn PDF document text
    • http://roocenter.ru/upload/file/66444440515.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93788783493.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/gunerapoziluberanedomej.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/47c72990a3538ec5fc1f85154eb11ce0/5669417559.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/97243053616.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/40790711191.pdfIn PDF document text
    • http://mp-journal.com/media/file/zalesikuvatowusuze.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bd9c697a---77809161895.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ijrucllmoegk4iams8t93nakc4/91734084596.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1bbba2439---85208373552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 5308 bytes
SHA-256: 3a538ecbe0a906a818ba21e8d1cde6082143597b47f03cf139e963a31828b1e7
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 10028 bytes
SHA-256: 5ca1bafe432d25e875260221d083633b0a275a0ce4a8c06df5ffbbd8e0763823

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