Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e03a2201625eb3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 04:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2fb12878ff802e12a5fbf8d9ce3dc89 SHA-1: cb2a69adfe3a4dd270ce6b87c9b06e51e3bd1098 SHA-256: 35e03a2201625eb3b0b539fe4cd9e513bed93f4d57f9cbe4c1998162ab3b8cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to other PDFs hosted on compromised websites, indicating a link farm or SEO manipulation tactic. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to direct users to malicious content or for malicious SEO purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a2e06c645e978ea589e11ab2804cef6/24914932480.pdf In PDF document text
    • http://camelliafb.com/uploads/files/202108291457325359.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6eca351b12d15158fab9f85a61d5a52d/saloburiwobakilaboruvi.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/56954181682.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/witudagutewiteviveg.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/48206498488.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db23f99cf1---14225396168.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/vozagometegifovugixavan.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c2ec3eea---xusokufiwudezetof.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/p6rm7s66fuuep9761agpsf7jsv/fedigumujemeguwe.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/misanutosotus.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077815d0cb03---poravixojiruz.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/85902355027.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/82407432274.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/65059343882.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b35f615f211---jenajute.pdfIn PDF document text
    • http://rts-3.ru/upload/files/sukewubupapoxadavodotur.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/fowefalibosumagotipeso.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/16136438305.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/46733650670.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/92206113159.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/simivas.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182f7ec2ee1---49292971412.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/38452120954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+autorecover+files+in+excelPDF 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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 10812 bytes
SHA-256: bdd8b16e9017c44cabcabe49b1e3d52220f127312fc87c0d16426babbb522e07
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 16912 bytes
SHA-256: 06b3d4a7d5e4dda64015554d8ceb0b099a60413cd07d370f836ea8cceeed009e
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1