Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a992a4e5faf74e5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 21:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fad7f065aa82f86b04fa1ea9111ea542 SHA-1: def74f2d4b3323439cd3db454298d141af94cb8b SHA-256: 9a992a4e5faf74e58650cd6e51d1d036d90362d81af6feafd901b6a9ca64df50
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no clear textual lure but reinforcing the malicious nature through its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=elaine+aron+book+pdf PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a5e76ce2715704f493de45108b21105f/73887597623.pdfIn PDF document text
    • http://funperm.ru/content/file/25970982870.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c480d022c---xefirakasiwele.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/t0qvp0pdrnto1oa99vr1lb0tma/lodapizapopoxiv.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608503b737a95---vakivozas.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210620213836.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vugurudikedugokimubipi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/dd3718qs9i05ddoqiqvvjc02fu/gedoxizozifujoxapevigarob.pdfIn PDF document text
    • https://ccskin.com/geektic/files/67460150965.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f7999a5d4eb---poziniwujo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612558db5a88d---35223522782.pdfIn PDF document text
    • http://sushibelovo.ru/files/lepifofegumusiwavurotir.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1bf72ffe---53886996622.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/setudumuke.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/xiwibojugudezolabutax.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4698134f3---53189785504.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/36171925212.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nevefimawuwokefuso.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f20834db38---60842235233.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/84aa329f81f739c931c14b5a2d8104f9/69617409447.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/bb9dfe5c12191b298c1b6662b3ed3a22/55780088958.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/vemukikixafuvulupoxini.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/25166309977.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e53li59k2qjh4l2e9aogcqa0b0/bosoborejaruponemitune.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/50684795030.pdfIn PDF document text
    • 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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10440 bytes
SHA-256: 3a1c913800b8c0455b9d27c9152b722ec9fff725f27553b93768426f34560809
font_02_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 18860 bytes
SHA-256: 74b0f6598b5350f31f458afe3a6d66099b4657c996f71d58f5824179f9b110fd

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