Malicious PDF — malware analysis report

Static analysis result for SHA-256 db15f92bdf618b8e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-22 18:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f7dd181a5f8cb3c4fe53140f689f16d SHA-1: 73a1b69cc1a7a08228be2cf02defe5725af09ff0 SHA-256: db15f92bdf618b8e1083d4f79051e01588ff5b72ca4f7c6100f7255786e44d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress uploads and other domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=prime+os+32+bit+pubg PDF link annotation
    • http://patronusalapitvany.hu/public_html/upload/72567176433.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tawazupajupexifewovo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fozudisutusi.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/wokoji.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/16053876473.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/53519493989.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/5727549771.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/zatulipeladofal.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/xituleguduraroganovizuni.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/47678244613.pdfIn PDF document text
    • http://pi-consulting.ch/download/42334752671.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/danesufosotojonora.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210917045258.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/fenimof.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/32740352971.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/pifimibulowomurigi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149080f09dcb---64645956678.pdfIn PDF document text
    • http://charivne.info/images/file/fudavetuliwizijis.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/ziwaruzaf.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/f9pqsmvp1au9kf97nj1rv3qnm0/92355526959.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/12450597533.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/rujamogojuwurejig.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c6b0379892c8597007fd3d6cc7dff8c5/3141128623.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/girisejafize.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/weriwobewifalefebizulame.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_off0000bba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA3 10816 bytes
SHA-256: 7cb0ca47cbb97c0542668f7df6e04820dea19fdeb7fa00cf3b994893ee67163f
font_01_sfnt_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 17196 bytes
SHA-256: c600bfc64ab227181bc97eddf7b5188cd5b2e634850c1684daad888353a767fb

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