Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c5335705179a7d…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 23:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6a5fee7ec62c25b37d3a2017c6b0181 SHA-1: 884880374f93507dbab4ed3fbf60b5902b25c05e SHA-256: 55c5335705179a7dc2a99cb15815e0a6ce4ca699540eeaa6aed341a0e3631c09
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload storage, indicating a potential for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bevapupobabineguji.pdf
    • https://basisnomor.com/contents//files/weraben.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bce93cb9f81---popupesosuvofovu.pdf
    • https://nikosdimos.gr/userfiles/file/repazowutilenurixazoguzis.pdf
    • https://zegabilisim.com/calisma2/files/uploads/41225092850.pdf
    • http://albertopizzetti.it/userfiles/files/kilugepupejokarivibeno.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/583f7af582c2d91ffb95284c9d8cd97c/14685565118.pdf
    • http://sendedianqi.com/upload_fck/file/2021-6-21/20210621102015195408.pdf
    • http://webhenevents.com/clients/868374/File/31264354627.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d002aca4---73448632864.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3ee9b788af437ce68233a2dde28f13d6/xamaduwawanapojuzemawamaz.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2e1a12f18b2d3a2668258116e2e95782/2603643500.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c0fb7217f---fogonumobuwuvu.pdf
    • https://cochleartudaskozpont.hu/files/6556705717.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59d394cb5---19845033541.pdf
    • http://emannsltd.com/userfiles/41697811452.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba719ba935---fanukigojodiwusakelulid.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46530e8288---zazegenawo.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1b4609ab---17116645801.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/23378608981.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160830ac8eca11---24303969370.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd888f740---38237905006.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=being+facetious+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 16792 bytes
font_01_sfnt_off0000f4fd.bin
689fb77eec52fbda35060a6827ba38de90764c2d0e1dfbcd3bce7d49d00960f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10684 bytes
font_02_sfnt_off00010d8c.bin
1402e66d212d6d4b320957b4f76c727a8ad59757306786619d0767f0fa54d1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 18068 bytes
font_03_sfnt_off00013d0a.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 16060 bytes