Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53947392e8d1316…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 00:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c137693ce79250f15b152926d5220a7 SHA-1: 8e64da65734af2b4befc10a6fa28902798203789 SHA-256: e53947392e8d131605a36ff9af72f5f4e60a1dc39a6c1f9c754cc92adb56b4c7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm or phishing lure. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://infrive.ru/uplcv?utm_term=tekken+7+rom+ppsspp PDF link annotation
    • http://palakkadtourism.in/ckfinder/userfiles/files/bakimulimaj.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/83314875228.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/22192363922.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/94753277383.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e09436e49---94690519289.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/19595203578.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0eaadd8f5969ee59c1b85d61f2144e31/faditijutuwi.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/95083174343.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/xonenekebekugizebonobokow.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/76482822098.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/mulunefidediwizegiziwan.pdfIn PDF document text
    • http://evola.it/userfiles/files/30815790133.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/61587676471.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a78286a50---lujasagijoga.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/26763102019.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/wabesimoxapasomug.pdfIn PDF document text
    • http://altinay-law.com/images/file/77930577428.pdfIn PDF document text
    • http://liyangah.com/Upload/file/wobowerusipumokuw.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/32105017217.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/20538304471.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/43853425444.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613744da9ba8c---47641587600.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613562e59cf7d---kalafuf.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/jevepofujavimobogupab.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fe3892f67e719fb84218a04afbb75415/dowivukejazebunefegetine.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/xopedewexavixilidexerojux.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///vudozow.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_off0000b420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 16288 bytes
SHA-256: 0982edcca69c2b19abfd86f2e22ebc8aaa7a3780c38d9ece4fe9d15ac998fdd1
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10120 bytes
SHA-256: cc187317d61e1cb1550892d7f5e4904fbe8d33f9cbee78bbe5d50ce76b691767

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