Malicious PDF — malware analysis report

Static analysis result for SHA-256 448240bcc4eb0543…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 15:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 331c7320425310d9f10ea3f4025f6ea5 SHA-1: 9d33ab0c58c08d7a768ea377d2f27946afcc053f SHA-256: 448240bcc4eb0543508dede06225dda25cba43c2681165a1d57b884d76c981ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the presence of numerous external links suggests a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pakistanchristiancongress.org/userfiles/file/vumuriw.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/27282614866.pdf
    • http://abwplazaview.com/uploads/files/tosofujurinurofifu.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/s5p803fmj0btthlk9l1pmg4cps/miweluwubir.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fc63e771aa505bf8f0e8de46072295a6/zugeguralevusisapawuvu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/354815762923d6937df9af9ffa359d00/72492693169.pdf
    • https://pergamine.com/ckfinder/userfiles/files/xirijalojeguneneredewi.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/efde2f1dbd2899fe671061a396d6f844/guzosarabuxapuzed.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e5ea28c---fuxaguwivunasipevubeg.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/39d880af2bbefff661dca7ee7625110c/44359985932.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tosabewupofilumegavujomi.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e2cfe4403b10da09b6e1cfaff287b45d/zurolevabixotasosozer.pdf
    • http://villa-carlshorst.de/sites/default/files/file/lufokise.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbec00db4e---27228110722.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a767dd861be---lofelel.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fc2d8d6c21a1217e055647f7b0fa46b4/28083187921.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d9062e9a021---36751349931.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3dc54c8e2929e2874459cbfe86f5c9d4/64705747127.pdf
    • http://ebiocell.com/uploadfile/file///2021051800280956.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/06b1a2355036363d8489c978ad80fce4/67054633153.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721533cb408---7637616077.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=catapult+like+weapons
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 16792 bytes
font_01_sfnt_off00010aca.bin
75c459ab08e2b0a30272e7fc9fd9ad1d9534ea2a126ab2ee30cf94902f9fde02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 10452 bytes
font_02_sfnt_off000122bd.bin
de61ad87d3792c734e44955858616d50c1c4a488a7c1071e0418aa89bbf6bfd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 16544 bytes