Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecc942e25508dd3…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 23:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03f4368f1adaeb4eedcee16f307fec0a SHA-1: c5ccb2895bc45d73a275250f88feeead0456135f SHA-256: 9ecc942e25508dd3dca6613468a818e355fc8e73a160fa0a0d0269315bd737ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution point for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3831cc6f---topirexut.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/618342b50f7f1d7f302c08ec402e3fbe/zajezovu.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/19198116895.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/54300593814.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/beranudiguvidu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/24944846194.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f84af2a33---480452907.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/98000126878.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/18c4f7b457728ccd395ee56bbd476b6d/wufejaban.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/97314619393.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/25318514149.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/62601753230.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505182957686.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/birezixeselovanot.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kp137f7k2gooq1v54a09n3mt0e/22576471903.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/93839538783.pdfIn PDF document text
    • https://dm288.com/slicice/file/begozafusijoxukusev.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/92956012362.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/surutebegixosugefil.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/119970426.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/49480899299.pdfIn PDF document text
    • http://goref.ru/files/file/gafebadudovopas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=map+analysis+europe+before+and+after+ww1+pdfPDF 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_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 10976 bytes
SHA-256: 8e376559131c34941f7f074d52086f2b95c07e6100c27c2abccef06754a33992
font_01_sfnt_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 17860 bytes
SHA-256: d249a983ca5123167f2a03f2c7a702a09ff329d765204542258e651a4a8e32a0
font_02_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1