Malicious PDF — malware analysis report

Static analysis result for SHA-256 a195ad418b90d5d6…

MALICIOUS

PDF

79.9 KB Created: 2021-08-02 03:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c77e3d693796375c2434ed63d7fd1a37 SHA-1: 8b2b8a0fed663c808e5517cea1a7a120379ec45c SHA-256: a195ad418b90d5d6194c9459b6b44e6dcbf5e41578de27b0cc7b2bd508f667df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to evade security scanning. While no scripts were directly extracted, the overall structure and heuristic firings point towards a malicious document designed to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vidaleve.net/ckfinder/userfiles/files/89762040383.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b07ea663ad0---93397705736.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacff6d057b---fubukikoji.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/vutovux.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/6393173825.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/pevidu.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/piruvigezafome.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/xifofumazos.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081d03601163---22630719197.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///13107861182.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c87c8e2f8---zujuxum.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kifotidu.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d3975908b2d1f6cad722b52bead898ee/52826226882.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/gukewapivojotogasobuli.pdfIn PDF document text
    • http://kalikraft.com/images/file/47252517889.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0fe4426db0f720dc1c405eecec056263/84068936043.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/41258221881.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tubewowusuwozaxolomemures.pdfIn PDF document text
    • http://swotaweb.org/img/upload/file/47532573641.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/kukeges.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/rq3vgk61g05q1thpa8p3q06a3e/dafezolaguxogikaninu.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/dezofero.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/xevodevexiw.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/wimuguj.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/42523527389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=developing+the+leader+within+you+2.0+audiobook+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 17256 bytes
SHA-256: 04b6babdf5b1f0205baf111c7346cb4cdf9abd2018edc7c1230842491ad7c9b4
font_02_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 11516 bytes
SHA-256: 4a189706a2d87eeeae6f419be688728f0a160216a132210c53bacffa0b4be277

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