Malicious PDF — malware analysis report

Static analysis result for SHA-256 088db5ebcd62dd7f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 17:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7aaef52f675245ff56e88e78827584b SHA-1: 55371eb4e0c23b6e37f19ffc2d26a941a0df3f19 SHA-256: 088db5ebcd62dd7f297a55aec2d2ff3673b49d82369eca76d60726dd1edc16f1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=how+to+call+someone+who+blocked+you+on+android', are likely part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=how+to+call+someone+who+blocked+you+on+android PDF link annotation
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458edb905ce---ridamu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/wivojezisifumo.pdfIn PDF document text
    • http://sinoorchids.com/image/file/25487340497.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/petavozupatofoges.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tetugi.pdfIn PDF document text
    • https://festacontinua.it/public/file/kunijig.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a4ab10c9---jufofubegakugowurolamigix.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rkm4gt0mmc7hhk4vehfn2enrfn/gupavejanag.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/jewajabotodevejoxen.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kuzerezusubinonowolapefom.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/46778421815.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/38112667088.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091001372419.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wudabejulariwoxegefon.pdfIn PDF document text
    • http://leton.pl/userfiles/file/dozofoperafewivizun.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/sizuputivibajiwejidiliwaw.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/26745972874.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/11777874681.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/pifegizatikeziridowanavep.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab3a4284b---kepujekuwanaruza.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/9519942800.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/rofitapajigipazujuw.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/solomena.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_off0000c0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EF 16936 bytes
SHA-256: ab4ba13ac5a002e1916686481de6cccb383a02e81fefb2dd290e86dd5b7b4d08
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 11156 bytes
SHA-256: c3788e7f5b3112104250d2cd118563cec4fd0c980a340496c4f10f56aa38d9fc

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