Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cafa6f81985458…

MALICIOUS

PDF

77.7 KB Created: 2021-06-26 00:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b767d991c57e27908b2e751a341db70 SHA-1: 0f5cfe9e887f961f81f1f1b81fe723ff0dec7899 SHA-256: 20cafa6f819854586836b3682cf3bcf80676f5c385b60cfc5e9d42295fab0809
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://philabc.ru/uplcv?utm_term=lined+paper+texture
    • http://olsztyntransportmedyczny.pl/userfiles/file/gudipizulaninasodusuxud.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf35d4516---zetitatoxewufonopofesexet.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0kq2loket8l2rb1ck58t3b9e79/dulevupakupuv.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/00b805aae3dffc7640861dc2b431952a/84296170924.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5dcd6fbc0---84846007028.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b81028d72---61146398028.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/5f0f3ca78643d29d5ac4c18a62ad934b/jofutaxo.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/queoir05qnm0jln3e3k8m1ojak/najaj.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/edg167ka69gsi1v4gvqss56k19/80731865703.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d1d37ad8556fc9973ff52039f6862fdd/fokug.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/f1kngfm68uav7qrlegemqmiir1/87271287332.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed1e701fb---nenefowuwoxov.pdf
    • http://bainihu.com/upfiles/editor/files/fajodavimoxuganapo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82ea6a50a---79222203000.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vp788bu03hvhngdn64fq9sell3/xusigasikamufawoweparezi.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d3782609---rifek.pdf
    • http://gamax-motor.cz/data/dokumenty/38815764252.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/65f1735c489ad2b38c35fa0b48c56ec2/dikomuvemumawomogobu.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dadb2c08e8ef197bc7f043bcaf8f5162/43521721421.pdf
    • http://garmagostaran.com/Upload/file/64929684893.pdf
    • http://alituncer.com/userfiles/file/joxosizegemom.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e983610fbd3f2bcd15d74d0896dc9664/98091401007.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1c978d02ed525e782c39031616f50a5e/25481664994.pdf
    • http://acpiindia.com/userfiles/file/fuwuxixufaxikakiputibiges.pdf
    • http://bright-mineral.com/uploadfile/file/2021051809373154.pdf
    • 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_off0000cf19.bin
976686aa11924efa0034054165941f3c55cba0182c453f92f7bc0afda4d3e75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 10208 bytes
font_01_sfnt_off0000e614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16792 bytes
font_02_sfnt_off0000fe26.bin
280797eed2ec3458f943c1be1d87d91f7959f061789e79ac378351f1babbb99d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 16676 bytes

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