Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ebac1942c266f7…

MALICIOUS

PDF

77.4 KB Created: 2021-07-08 21:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3aa51d7e942f3e4836ab8de619c8fff2 SHA-1: 9b04e53959358c188db0eaa0212e47c84e39d1cf SHA-256: 29ebac1942c266f7f47b93efc9a2bbc91a1b130c6ef846bf11ab9aa9193dfc33
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://coytex.net//ckfinder/userfiles/files/52404816077.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27171f134---degarisolerum.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/79023928aaaecf8a873a8d575ce97fe5/54599783437.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/mobovavaf.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c78a8cb52e17b68083e189009ae1b56b/68025082235.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hh45o4c20pqc8l9qq77k1fihb0/68861751723.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bedd2ea11f---nalejukutugokalaji.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9f5c702e---fofonutuj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1542254779---66231448783.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hqbc3rmlhvpjthkv05585bk4l9/33678421771.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/mezotexoripexopazonezupik.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/62647160214.pdfIn PDF document text
    • https://promise-land.com/upload/file/vapotepobeziruwa.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/79965004019.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/wiroripokejopaxuva.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084002f1e1e7---digenilododuposomaf.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/lagorunime.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/21b0f62910dd0cef13230bb51baab629/tuzavinupodadibebumejikaj.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jodegusegogisofutepibal.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/wodelaxosigutelem.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/52249174116.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6b80f5dc97b209957301f9a9ae456519/pamabigigiboduwakus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fake+phone+number+forPDF 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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 16660 bytes
SHA-256: 4eee9b413e6409317143f5fb4fd9f1418bdc7c04186f1cbd00a93010c61a7e31
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10528 bytes
SHA-256: 91d877883237de776f33df534869fd5d9e4040022a28c359e47559c15949f000
font_02_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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