Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d57e233256e6a47…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 19:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9103cd69020c68dd8a236b7429650989 SHA-1: 99a7c4e2ae6f37d20470bc782aa1d4917b1081d3 SHA-256: 0d57e233256e6a4755a84ddbda748d6ca10ba1447ceb3faa9b96418d646d0318
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded URLs and the heuristic firings suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://union-montage.pl/userfiles/file/sazanazapusisomezozogituz.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3babbd9f---39048453989.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e56815f88c---81298654316.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/75348626569.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943b1f92e79---21903146037.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/f4eimoedcqtlnct8dvoaulcu4g/49362950007.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/63l2v3gql6lguqe0n8l7ab4ckb/6322442538.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/lomutuvot.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/35401461014.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ede69416f---30309713635.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b5c435b09ce0332b8c394245ac56a836/79330929835.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7ec839a07949efdc0a89f88abe1af4d0/xovafekulase.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/49684065381.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e70d80aaf9c31316099aa764c4004ac/jodilamokurolapavisumoloj.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/lulutugevovoxu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0m604b0emsttqvv6507i288ivp/keziresitiv.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/eagcujg379loqr7p7kbf5n2tkm/vexomenab.pdfIn PDF document text
    • https://educhina.mn/editor/files/98348337394.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/88791936064.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/rejowerujekav.pdfIn PDF document text
    • http://robedecreateur.com/img/files/53401953311.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/tekazu.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/xinivu.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/2592155904.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/58963085898.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210708072550.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/29270361595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+simpsons+dreamcastPDF 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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 18596 bytes
SHA-256: 7267eec4eb7f7500b6a47dbc8c77e5814b871121d4dd543154fb0fd9194dee8e
font_01_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 10696 bytes
SHA-256: 8575150efb4ba72173de207f9155d3081d4c2ccc119114f7bce6caa14118350b
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1