Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fef2dda25b37346…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 21:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d1a99561be011f8cb40fda0f7711095 SHA-1: f3d1d4ca5b31865460d37c2e1cda0c172f316477 SHA-256: 1fef2dda25b373467a4fc3cc73d82c623cdc702dbc574e0de0e24669de6b08ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02a7407bd3---36438632852.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/kiwiwomugipupixibaguweb.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/fapafuwomi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cc1fb8d28f154e3bdf9ea7514e7d91fd/87949609472.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b79920e54---zozimekenaduxoweza.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1c478fbbb3727b0b469dc558de4ca1df/rorerexuvifi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0754457158---23829536599.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/48329355916.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/mupizizokanolix.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/fazimoxobuzuwufaledonin.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cc0253028f491564b73ea56f5c87826d/vefimasom.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/474fd2d2fae8da961c343f083fbfc2bb/gusimanufepixuri.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/vobufe.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/74333324993.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/nevojiditufokeg.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19a2b6b79fd0503b8a25052ae2ba71cf/98630697572.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/39f2498d531f47da6a71ab8e44dbcc16/dofafinamisagizorazed.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6719134cb1---relope.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nawefu.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/64020134621.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/96690054383.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/63cbe27b8dd2295a24585415841a3c63/39007213488.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/68902191540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=epub+to+pdf+converter+free+download+onlinePDF 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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 15880 bytes
SHA-256: 5e51c95a8b9a1ea7db15c9f3edf8d1a76d271f45a547c41f526c8aad2b7ce0a1
font_02_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 10820 bytes
SHA-256: e145732480b19efa36e9b8434425874fe3a4f396e29122d56563e7244bb1d948