Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbc77d59a1e7b4a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 12:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c2fa12605940dae2a693277171307ac SHA-1: 944dd69ffd0f5bf7c150fa42a1c707cebcd07019 SHA-256: adbc77d59a1e7b4afd62bda38c3fcbac990c9a75915ffc109a441545573256de
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://technocom.pl/editor/file/botoka.pdf In PDF document text
    • http://gesundimjob.at/images/content/files/botubivum.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/vigodaganajizuruvufopori.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jojodifurafuwuwodod.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111bf8f8d34b---32596183480.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7c7225161a6b6eda3629692fe7d11162/govizadobolajagazob.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323695145d6---38463282032.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/10017357598.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/87973178761.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210701_928D06909381DE10.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/pumizesunikodegukinoga.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/4159871458.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1f0a67c3cdb686854372ab30f79141a2/wuguke.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160760d2d0e09c---21613894817.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/96592604718.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/38684df4038726e26664a03961806f56/jokoduk.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/63293848458.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/55494ff7322da5b6d4740aa7489f14b7/kowinezikigipekoputuji.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607624e195781---45914299132.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/70108146182.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d29a8d2951a---tavosofemuxeriruvegap.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef516a44a---kenewevosewinakiwapogesa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b96095e7---98962565477.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/1129374974.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2475c8d44---tokusasexusaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=synonyms+and+antonyms+worksheets+middle+schoolPDF 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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 15140 bytes
SHA-256: 6816d3dab6f60eab5c24c9856cac23005f0cc27c1cd27333d08466a194c80c62
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 11000 bytes
SHA-256: d3d1ad473f72650488e805a5127c11d6555a73d4350fca6293e4ef6f24c93ef3

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