Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a51b38689869874…

MALICIOUS

PDF

88.3 KB Created: 2021-09-22 22:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 44cefd798e69897940af2df64752b151 SHA-1: f9205759601e12f91089b3fe2d1a29c7f269bddd SHA-256: 0a51b38689869874910da5355be3edf08ea704a2df315cadda0b65064a01a487
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various unknown domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://suachuamaydemtien.biz/userfiles/file/50875654528.pdf In PDF document text
    • http://yossy.biz/userfiles/file/kotivijukiwiji.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/mokefenasikawalorafazo.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/veriritapisosupakejagom.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/93536c71adf543baa9b71a837091d598/vaveluraxube.pdfIn PDF document text
    • http://salt17.com/userfiles/files/27819454481.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/jezedapewiseko.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/bamawamukasogage.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/33262901259.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/83032647009.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fukedokositedevegobivev.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0000d6223a116d007ff358e06242cbad/kilixavewet.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/40273820059.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/virekelim.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/658809182bc8c73944f2515ebe10bd90/63896248711.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/pomuxokejena.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284164f582---45517061683.pdfIn PDF document text
    • http://jinyezi.cn/upload/pejozilowovo.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tipali.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/vubezobuwepozi.pdfIn PDF document text
    • https://educhina.mn/editor/files/67167579081.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/23982522458.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/movonufi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/72935147902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mathematical+proofs+a+transition+to+advanced+mathematics+3rd+edition+solutions+manual+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 16572 bytes
SHA-256: 9e86c49f2ce45515bbf10c49d958ee82a88965c547179c62ce4fa668ffe289ce
font_02_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 22936 bytes
SHA-256: 5eb269d8c4036f16d65789ebd4229d7829c8d9aa1c97c199dd301a974173348b
font_03_sfnt_off0001374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374B 11216 bytes
SHA-256: ec0bd55abcc477dadd89b65e5970d3443a02d7a85ab8ac51a376436564439f16

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