Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a9d35cb1c70534…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 22:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56dc08dd2acde886da6e3b8d2f06ceb8 SHA-1: e39ef3754f09bd89c6c8f99b16b49ddfb5bde454 SHA-256: 87a9d35cb1c7053410e0376d6a04c2704c74aced08834013052da1a91be12384
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to external sites, potentially for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://chcial.ru/uplcv?utm_term=mi+pad+4+best+rom PDF link annotation
    • http://net-work.cz/data/file/rizanufunep.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613557f26cfb6---24407250390.pdfIn PDF document text
    • https://maisonforville.be/documents/file/12048148673.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/zipup.pdfIn PDF document text
    • http://oodow.cn/upload/file/210913024711468699p5t62nn8by78.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/23468738381.pdfIn PDF document text
    • https://asi-filter.pl/files/file/wadav.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/zewejorapakavekupuravulu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/71090212081.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/30780239227.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bojisiwivaneleme.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/detadepudaxezunejevax.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/11806251507.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/29733701215.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/40362171661.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/069b15f0420f21d97aa5c47ee5a1646f/16713597756.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/ninokukusekuxexexudafox.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ae2270494759a689e997a9ad3a4cc699/kalotisatedixewu.pdfIn PDF document text
    • http://cocoal.com/uploads/file/81241238442.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/8760572277.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/domirogu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lefidezuxevuxavopivedilik.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/508722a7e000fb5b7842a61e1f52121d/fitazakirarabebavuvaza.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/sekirumeraruniseza.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/ribajubirorubixu.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/fefewamuzenadeduzan.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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 10612 bytes
SHA-256: 0c4d68f01a5325267b156cbc09f630e624852a7800d34e30720b6fca2c55c13f
font_02_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 18176 bytes
SHA-256: ec80dac3e7c79a03a8d7246d408546866de5b8ab87e61b27d6acd5a922eb241f

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