Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ea00dd4008a638…

MALICIOUS

PDF

88.3 KB Created: 2021-07-06 19:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99118513eb8f95988d4f5e5368a6cd52 SHA-1: 33951382ff83f0787e6b81bd65e3e6e2dc417a90 SHA-256: 93ea00dd4008a6388284017096cd2ed32b5fc4827ececa5652a5f84c2c65384e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=bloodshot+movie+review
    • http://adabaskimerkezi.com/upload/file/nifaj.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/geu0k6ck8jel490iln60p6sckf/jixitasar.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c2beb042---dinixagevidokepabiz.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/77866d5400a5327c53a0e711c947fdfa/todiniduxolelogikadi.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/khnges1n9fuu1rvlisva9mplu7/26307234780.pdf
    • http://szakkepzosiklos.hu/upload/file/54183883682.pdf
    • http://alphasigmaoverseas.com/userfiles/file/rojawijijureripuw.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e02fdeb3a---ziwuzumimadoda.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ec0ef8b7b56c661f108d4dadcc71a60f/94158089297.pdf
    • http://azseal.net/uploads/userfiles/file/5613968327.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072642d61813---89055765284.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e46813b24dd---jopipigekiwe.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9cc438db---51601528117.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5a892839---tipox.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb2e530a3---93654271234.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f823c396e306d5d9697fc46e34375f56/94205539993.pdf
    • http://tcsm62.org/uploads/news/file/meboxomuwewaxirixijiti.pdf
    • http://pensionpoint.cz/userfiles/files/vojigilakolibiloxisexid.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0c290868d4b22cb6d6d9a0744ee8b042/81564245778.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/82bcec738ccc3feb4418eeecc53dbb8a/tagiluxugirepotunukaze.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f56ebd402a379778134fbda6c8ed701c/93797202383.pdf
    • http://degrossier.nl/uploads/file/28419691357.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/japawajifizokaliwu.pdf
    • https://abugfreemind.com/userfiles/file/75094733019.pdf
    • http://murphysbeads.com/clients/54316/File/55105249906.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f769.bin
9874100c54cb64064e7c1510e7cd9004a567fae1dc4d3bb82f57afdbe9c0cff7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10452 bytes
font_01_sfnt_off00010f2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 16792 bytes
font_02_sfnt_off0001273f.bin
901376a0cd51a3714165f9412efd10b1c344c10b302e674706dcca33d94bbbf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 17364 bytes