Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf8bb0d5e8b204f…

MALICIOUS

PDF

81.4 KB Created: 2021-07-19 19:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c4dac81ad2c62cd739f95eb863496ab SHA-1: f54c7872d72a29e59fda5cf66963d7d675af4a7c SHA-256: adf8bb0d5e8b204f6f5f843ddd35fdf78bf33f52549bf4562d64eee39414c7a5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c760cc5df38a6c26d2178a5dc8192ea1/6809374308.pdf In PDF document text
    • http://mamtomchabahai.com/uploads/files/files/24730223988.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c446d321fad---8080104691.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/aea465599d40889ad113d83f35f7d2ae/7731199918.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/dajuvuferoxudizefapip.pdfIn PDF document text
    • http://falerisztika.hu/tmp/zarekorokob.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/74459147301.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/4579698264.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dafff0d00dd45f3a29a34192c5dfc586/nojifis.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/45d129b403dc7f1a61864c8e7dc57004/87214481419.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/wesaderulume.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e102faf6aa---38498638598.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/lifokuzaluvexig.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/40f8f3f0620421ae49750fe1a9595121/60704478031.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/92885446390.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/24568059123.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/8180063446.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/rifefadixu.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/balezawezij.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/34ba65a12b214327515788686f35ce1b/17535231628.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4f564fcf---41082375042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=causes+of+negative+intrapleural+pressurePDF 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 17508 bytes
SHA-256: 4572a297b68926072aaa3e52eaabba504384a01e8c90698525ca4b2cf821cc36
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 10728 bytes
SHA-256: c50a034e6c10b103b63fcacf8c7274cfa83ecc90bcc15980342316c76f9687b1