Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56047ca766269dc…

MALICIOUS

PDF

104.2 KB Created: 2021-08-24 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea88d11ea218ea9cece3e176c177a16e SHA-1: ee29f15109dc37bff7debac66afc5a45913c5070 SHA-256: b56047ca766269dc211a42955ad23b4d157bf7df29591493166af47cd9ff80fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is part of a link farm operation. The ML classifier and ClamAV detection confirm the malicious nature of the file, likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=adult+beagles+for+sale PDF link annotation
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/81fecda6e166b44bb383644075297ae3/16029425347.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160740864da1b1---pumevaxojidowasolinewu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/52902986825.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/22792970515.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/nukugiwizojozufabe.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210707035040.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/95226226999.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/98821514507.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/likebitafelobazujabasuf.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/280342046714.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/87041317643.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/96649055995.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/jepanedo.pdfIn PDF document text
    • http://minerva-collection.net/files/files/89034709182.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16106cf52a32b7---84765072975.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7a7613596bc6f9d378cfe78d06fb1e71/37961882626.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/xivisatibewoxamam.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/rumad.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1d9fce4c99975e73c671d03ae75f3361/wifudoravuso.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac10e9246---rewenuvuvagupakoxu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee733653688---63742451369.pdfIn PDF document text
    • http://cmtsport.com/pliki/76646498556.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/22733239605.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_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 10552 bytes
SHA-256: 4ef3e69b21a32bc53ae9e369f060290baaf2a0577620f1be59029578def1baf6
font_01_sfnt_off00014ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B3 17912 bytes
SHA-256: c3060fd0e770cdde1139845c6772aac0c503f1fbddf31496392eb85e14d3dfe7

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