Malicious PDF — malware analysis report

Static analysis result for SHA-256 081dc50818a0d64d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 05:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 276e2648690aaa86fe254e62650afed6 SHA-1: 74746682afdc2ea38de33519bcdbb034d0d2ef09 SHA-256: 081dc50818a0d64d5029fe77d3edb631bb44a0c45203ee85d53d5a2a14549f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=mindfulness+and+acceptance+workbook+for+anxiety+pdf PDF link annotation
    • http://zonazero.es/userfiles/file/dusimap.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c3100fb7dc22020edd76f2e6a1ef9b3f/suvadaresararu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/58472746396.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/jl7gq4svctjs6sl8el0pjqc2n7/34850828142.pdfIn PDF document text
    • https://ferropula.hr/files/jetepedilad.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/gowug.pdfIn PDF document text
    • http://ktcz.eu/files/files/42624842738.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4166792799b101ee30a8666d28a4f247/doxexilunewalopi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/08beda97d30c38eb5561e5450368d847/75164571719.pdfIn PDF document text
    • https://lecapsuledigian.it/file/gapujuw.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608742b581ad9---8576426807.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/9159162102.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e82ae5538---tasanonemutoz.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/85077056934.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c49f57485df6415cccdee2143a0c8604/sinelelozimu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/2936145764.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/bibagoduripibevaxirapavuw.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/48296329342.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/84047885867.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/91714498431.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/55804541224.pdfIn 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://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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 11240 bytes
SHA-256: 384f5235fb6e42e4ac14113e8646e504ce8d2b530f8cb09d301a7cc16f37c601
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 17880 bytes
SHA-256: 36008996f05b90551ed1dfca868a4dea4749e5d6ccf575a036a79b44650ac1e3
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1