Malicious PDF — malware analysis report

Static analysis result for SHA-256 633cbe1cd4c148fd…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 07:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da1a22f798768ef4085e1a9096a8cf66 SHA-1: 0dff28fd65029c1aa95bc512cb5d3a7a7a71adbb SHA-256: 633cbe1cd4c148fd8e1d78b4ec7bae53ea61c8bb37c9bb124b8a0863ed01f357
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, indicative of a link farm designed to host malicious files. Heuristics also indicate a fake download button and a callback lure, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=please+come+home+for+christmas+by+the+temptations
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078143e8647d---pilawokubuworatudaboton.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cd7394cb0cc71c02ed5a439115a40e08/dokoxovejelilitapazekeka.pdf
    • http://remont-elektro.eu/archiv/file/42445226878.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160caacc5400ea---buxenupusibowusin.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8b23d3bc48858e3c381348c75ad47080/juxob.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ad0cae5d---57819769689.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ca6ftfqqpmper1tttjpr0b13s1/makidupazuduvawij.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e55b13c38---bikulitixefex.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44572ac62---fuperijisadasoj.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a399d2c8e9a---74471491017.pdf
    • https://advance-pack.com/editor_upload/file/fezudinofezafakilawaf.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac284f65147---fesilefixulokopodu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51b22c58c---wavudeperewawi.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58be7e243---vexumogijutomunigud.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078569b77a84---44257105818.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/78047591911.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082507901529---64294289202.pdf
    • http://101-games.ru/images/uploads/files/94741416859.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1df2798d618d9cdb750c5f9966a29ad4/rizabosufe.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599ec142a5---wominafi.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/56702b6634333011321933d8402c1943/1751763387.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/3702219260.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2e1cf06b---bukapiforisi.pdf
    • http://dribblebar.pl/userfiles/file/wowifusisirututaba.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca24cbe21---71113577666.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/zisuxupudaf.pdf
    • 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_off0000f53f.bin
970e8d08c582faedd05c1e2faf19a3be0bc7e9a8ebb77cd35a46a5dfd696e148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 11000 bytes
font_01_sfnt_off00010e66.bin
a314f1938cd279ea6dc04bd3f7757ae691ec43b09b9845c0bcda55274f8492f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 17700 bytes
font_02_sfnt_off00013d21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 16792 bytes

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