Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fb78f286288169…

MALICIOUS

PDF

96.4 KB Created: 2021-09-07 03:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a4059836161acb03da7e3aa8c419801 SHA-1: 01cea091e3433a190f8d2af2828568ba729bc9d1 SHA-256: e5fb78f28628816903544e075559aa0561dd7e6fa56c87bc056ee0554f5cfe90
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The file's structure and the presence of external links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://huntic.ru/uplcv?utm_term=things+fall+apart+synopsis+pdf PDF link annotation
    • http://cgl.lu/userfiles/files/putufixo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bfe0fdcf652c8469fa822c5973a447f5/85508183312.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/47143510936.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/be0844eb54432543c67e267180c819c4/foxene.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/56749265264.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a64f85d0c---zibewudetevalarime.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0ed0f73c---67838366262.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a98e0acefd0729d927c67742b95ee17e/83800910221.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/40828065897.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/kabuwilugujuwiganazaxo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc766c86---tisuroworetamozowebuzelol.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/vopizirutibawozizus.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa9aaabf4---1125076920.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/94332707248.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/b50a98ca38dc866fad2edd8d9a134020/gikisavike.pdfIn PDF document text
    • http://iltorg.ru/upload/file/jusosisesifikela.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd6c1a075---10832089308.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e8bd6df0---muroguxed.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/nodukimuwokof.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/nawosimanux.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/vozofivolalikigakad.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_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 17232 bytes
SHA-256: 81634ead8e7ab3ee179bcef80125261be2c985abca1a72536f3525ae561c726b
font_02_sfnt_off00015bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAD 10720 bytes
SHA-256: 901a69345815a68e8e3cb3953e07433efa1ff6034441e5de53cd1821147bdc8a

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