Malicious PDF — malware analysis report

Static analysis result for SHA-256 86113abc35e0584e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 12:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32f58a40954d3edfbd6a85c6f8393242 SHA-1: f055ddfbb7f9a35384f758d4a0326a18b7bbf83f SHA-256: 86113abc35e0584ebd3c1396c62fe599b1a4fe69380bd7039a55b3c58b0218e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

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://oreopay58.com/ckfinder/userfiles/files/vugujipadaxijinamoboloj.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2910f6cf---devurezumidogi.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/jefezexuz.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/gifojifepejuxirusotiworiv.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/melinasadisexokawu.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/zajibuzudagal.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe1a7d063---sekogodi.pdfIn PDF document text
    • http://goldmustang.ru/files/files/lisutukujojafi.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/97184987399.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/nasubegazuwirizu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d1befc9b1f259158bf6d0dfe6867bd12/jurokomajoda.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/60409771455.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/50090257395.pdfIn PDF document text
    • http://japhina.com/upload/file/fewodebojifujajerigobuna.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613504260bc6f---61739772184.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/vojaveruzanusinexudumimow.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/pezagobojufa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b73538df6---xogedoxogi.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/81649287770.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/xawuxogizutelokixepokar.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mazatafufuva.pdfIn PDF document text
    • http://lovesenergy.com/file/ripobovawefe.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/33358462340.pdfIn PDF document text
    • https://coluer.ir/documents/file/nedelapikuxotunavoj.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/demimepisezolerafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+san+andreas+v10PDF 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_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 10260 bytes
SHA-256: 6f799fee6a0e7955e912385523712b17dbe4aab7c0d5409adba732d9435dd0fc
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 17496 bytes
SHA-256: 2fea8e75e058b5aa2b8edb35426e1117a06b62257904dfb072a7e9d4f7d06529

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