Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab095fb8e8db6adb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 22:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46954ae0e7dd8f8b7b51030d8f245fdc SHA-1: ffc36b37a25c79a5737a1edde0c3da9274ea8e7b SHA-256: ab095fb8e8db6adb184cb090b0b647b456b2a0ffce37fce46ebb076e10b3cc8d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the structure indicates a malicious intent to host external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abd13082761---susipejivased.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081759fd3ef9---gafobotabozakov.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/xotewolat.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c436e15a1---gezaledurutodubi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/0spvd5pro0k3vjson0v5iulm45/juxekapojej.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6njds36r18jjc7fcu8799mkns3/60058632704.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5rbejl72qfansmd3b9ka4m4et2/81214740416.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f3296d749172db96b671e01c323c5a48/nujatobonuzu.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/36919244517.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e246d38e5ca5eb33372b7c2282605fbb/47415785614.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/16553449356.pdfIn PDF document text
    • http://mylodge-naoshima.com/10721118174.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/kavegaraseb.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/vukalititowadanubajasuza.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/83175149036.pdfIn PDF document text
    • http://pronobile.de/catalog/file/votedegosanonozevizejake.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08674b3e6---nikenazana.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/q0tivm4j0dq4qs08fmva5sdu3k/88889573638.pdfIn PDF document text
    • https://yuh-tarng.com/userfiles/file/farujimal.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/77536296715.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078920b01db3---mamowovelopep.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/2666264230.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/10261553972.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b04a7d2a---88786100565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=latest+biodata+format+for+marriage+doc+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10908 bytes
SHA-256: 4d66a38bc534579bb260b236c737011cd3b1510200e1014103f0505c1b86a335
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16076 bytes
SHA-256: 37d052f2da8495ad031c10093bc2338f688ddd5c75b5f90fbf9f31fb35020f9e
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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