Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cf13698b0c8da3…

MALICIOUS

PDF

73.2 KB Created: 2021-07-04 11:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ad34ec792e741807ebfc9626027ac85 SHA-1: 6aea028dc7b9a9bdfda1a7641733d2ca10d11f45 SHA-256: 45cf13698b0c8da30212faed42dc1cf5fbeb61267299abcb9100f15a12422cab
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3275fcef1c623437c7c0e2ad0364da67/xesevefolebapir.pdf
    • https://pabrikangka.com/contents//files/tibavipujifo.pdf
    • http://www.nomorcantikjoss.com/file/34010251096.pdf
    • http://sevimticaret.net/userfiles/file/94772196235.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607319ebaeb8f---16038478961.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc2547ada---98408936876.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/80dbb867535e2bf89166592f13b3e66a/31581117642.pdf
    • http://www.sport-konyv.hu/userfiles/file/pugewunegawapobupi.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6d45cc4a336914e00379cf3b4fff8ec7/17940198991.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/btudn6n4m834o8u879ocsm9gmn/pusutokotapaxewakokasusug.pdf
    • http://amoy-art.com/Upload/file/mesatumukipijugojepuvaweb.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/066b2fa1c2a17e73198abf7610db5866/81219786361.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bn1d42imtm9ubg4ovg898s6eag/xakopa.pdf
    • https://aawyx.com/sites/default/imageuser/file/basejidilopexekatupaxod.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075a71122f74---wunurakamudiluguk.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0ecaf089---61150762561.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a6e2d6193b615c7c0e24b48fce04b566/33513630518.pdf
    • http://balogmihaly.hu/UserFiles/file/zasoduxufesonafopo.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/12kqkvf2g13uofkfn0av51gv4r/94477710232.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9cea3411c34016d7c286fdcbc8a37c2f/damex.pdf
    • http://qca.ch/userfiles/file/tedeba.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608841cc17716---vomejusilimuxusul.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b84c6d0ba---nagukofejobuw.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2017bda2---28866854751.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=eighth+grade+math+worksheets+with+answers
    • 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_off0000bba6.bin
e4d045f00b93a6ec9e6fa6a606bef54966fe483d6454b5d82c8f14c63b99fde0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA6 10808 bytes
font_01_sfnt_off0000d444.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 16792 bytes
font_02_sfnt_off0000ec56.bin
b881a303fd077bc1d88dbe3ab96d202e63ca8f3a37ab904afb2504d06a00448b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 16448 bytes

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