Malicious PDF — malware analysis report

Static analysis result for SHA-256 80334d565c27d100…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 08:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75472bf996456d351d53c82608e89706 SHA-1: 020b38903634f6ee41834782630e8869d59ef45e SHA-256: 80334d565c27d1004ebaccd22f96eaeed8f60096da56ee75006697647f5cb13c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or purpose. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. The primary goal appears to be redirecting users through these links, likely to phishing pages or to download further malicious content.

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070dde5ef035---87637979929.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cbc4bf009---kesudosudaxosoxaveki.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e68122b---dazosinevapopuva.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216291453184453.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/a86d09312aa8f06f5ceb6f3493fd5c3e.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/35243584324.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h98lcqhbetcer3k7628od94or2/mojabapelamusitenove.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/mutudodumevo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d6f9ajck5n659qs6veie3helj4/depuf.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea0235622---36152807267.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/68210921071.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e64546414f3eb724df0c956accf271d7/40412895655.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/zovovej.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/v2fpi12tbsdqv5ssrsg1b32nbp/7941789643.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/aa9017c8ba1408ff5a0748d5570578df/15044812669.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/29749473506.pdfIn PDF document text
    • https://actorconseil.com/files/file/19513156904.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/dae90bf54aca3c6bfe96ece7700f09be/ludixad.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/wifigosogike.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/pevitis.pdfIn PDF document text
    • https://ibextrail.com/editor-images/semajufidorajavexomagek.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/64745735220.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68bc8fc7c---gavimotebovupopes.pdfIn PDF document text
    • https://afayl.com/userfiles/file/dodada.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vujukabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=medication+for+hypothyroidism+include+treatment+thatPDF 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_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16644 bytes
SHA-256: 2f2d2837e3bdd0694d583e9b5be07d5becf793e1baba6edc201c235e6f5ce895
font_02_sfnt_off000131a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 11092 bytes
SHA-256: 220e17f1cac6c1dd437cb2107e2b04fb79b8cc40b58bbc3c23dca89108ff2645

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