Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcbf0615f70fa3b…

MALICIOUS

PDF

90.4 KB Created: 2021-08-18 07:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d0a134ea39893fec7b2e1b72de59c4f SHA-1: 6bcc81c694f3c16a12ba45d926f8842509fd0eb6 SHA-256: 9dcbf0615f70fa3b859bd0dcf01722713f4f448cf85723ee0c91f554cbc0b239
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The heuristics identify it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=principales+caracteristicas+del+modo+de+produccion+asiatico PDF link annotation
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/vimudilizubigigonorapafo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/shm9rvh0a5c6hjomv01m907kts/86744848960.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///98658168320.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/merirunug.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/josibamepuzasenokiz.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/wijuxexipajuj.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/64853478684.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/88136104060.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/tuzalewovonekog.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d45e023e1---pazolexamapajikidowufi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lolutatifuvezuluw.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/tezunuvewomanobutavesaja.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e400361222c8fb4757d6c394ce93883a/14286669342.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/95588507829.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c257de1df---30728871470.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0752c2ef---92495497983.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610317145725a---dagafularatufojeperuxom.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160767d3d828e5---89117463962.pdfIn PDF document text
    • https://85097781.com/upload/files/tetibotiparaneni.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/da0996733328e16d16543d1b297202d4/36816208045.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sitepurubuzusefibebikimok.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a3129b4c02bcab8f345c73f55dac028c/finux.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/317ed78e422f4a50341e8f077c4be1f9/lowikisusi.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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10776 bytes
SHA-256: 0f6152bed64895ff4be22ab2593bdb9e2b756cf4849a7b46ff887dc332162761
font_01_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 18148 bytes
SHA-256: ce0dddd3b02d4fe945a26ec3b2b2851a3bb787ca346eca9eac7bff8441637625
font_02_sfnt_off0001402f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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