Malicious PDF — malware analysis report

Static analysis result for SHA-256 54597c79d4d83cc4…

MALICIOUS

PDF

79.7 KB Created: 2021-07-02 00:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71e8e13b217d6ca8af77cadd1fe62705 SHA-1: c10a9a9907e36cb2f66c14ac516670709f178e67 SHA-256: 54597c79d4d83cc41aa63fb096f8087464f1a681f8917b8fe05aaf7c89c012ae
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload directories, suggesting it's used to redirect users to malicious sites. The presence of link farms on disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160db994dcfed1---66409992181.pdf In PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/2j5ij4k4jrpthc8namppdnrkdi/zodumawulem.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/3kirv2m7a6e4h9be8llndfor4k/rujilurazirigixowala.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ca1d2051---pajovuralavodopadu.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/55883374525.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/87925094621.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3ae0048ea---kivawefitutuzewux.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/71406963565.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e30710ba4---99356030965.pdfIn PDF document text
    • http://coumert.com/images/file/rudavifabirisowobiwu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kdjp05c1bs7e8m0oefkk9esmhb/89520560440.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210508155454_1375229412.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/pafal.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/fomoxopanebapagofisiliki.pdfIn PDF document text
    • https://abeess.com/userfiles/file/6310252605.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976e2cdd5f1---44564781983.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/51184e0175369a28413bce82c2b9ada5/85433785021.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/fapitibamit.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a90889c8af7---86803465404.pdfIn PDF document text
    • http://www.puhito.hu/uploads/40677110304.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/23318841184.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/sikakaluwojuwi.pdfIn PDF document text
    • http://hrudolf.com/userfiles/31100781924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+did+the+ten+percent+plan+requirePDF 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_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 10564 bytes
SHA-256: e1f461dbd26816670f506ab5dd56cbc932e4e59160b2b65b0a21a5170d96934c
font_02_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 16340 bytes
SHA-256: 82e43bbb1ccc3175c94272bcc0b5834ea907149db67958dc2dfea2e7344a5e7b

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