Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b126e9f4d63cd6e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-03 19:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd14cd6766ea0fc44e6294834124285a SHA-1: 9059f353bae9b56d3d6f28214167c243823ea36c SHA-256: 5b126e9f4d63cd6eacc171f4be86a55cd3ffe830175ec2729352a742e2db7311
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and URL patterns are consistent with link farm techniques used to obscure the final malicious destination.

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 http://riskhedgetech.com/uploaded/file/32369647660d9602bbb1bf.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/821hj96p4i89v5uj3hb92or492/58635863945.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bupogaviko.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/deb6945a4cab5f977ffe0620882d12be/jobepaguxisiratenoluwiga.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/24281630672.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/6369217902.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/00311004cf670d1fbc9442f79aee31d1/52167734516.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/96190670793.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161163e4ac3d36---viwex.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/rajupedewulawoxad.pdfIn PDF document text
    • https://blogsma.com/files/98308650377.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/wewufiwu.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zawuzurusijapufowizidat.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d151337c---34005915684.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfb592644---86793786392.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/simitimijola.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/vovesinigenowoduv.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/80797604449.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/55805401069.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/vibigiken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gmp+manual+downloadPDF 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_off0000b6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E3 15924 bytes
SHA-256: 6fdaa166e19b2e8fcd6b378b0bc8739562a8d25a54db48a2bffcd857d4eaeff7
font_01_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10188 bytes
SHA-256: e55ce5e4131dd342332b5cdaecc1795f190242ffdf8da496f588e003ab4d7abd
font_02_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1