Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04643841b75ede7…

MALICIOUS

PDF

84.4 KB Created: 2021-07-13 04:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e87c386698adf1b6692f4eccd43af887 SHA-1: e3491e40b64ed863203b606f04ff891e5823c521 SHA-256: d04643841b75ede7191fcaa2e8fd6eaeb4d81d6a70c8eab8cffd649d76d54e85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into clicking these links, likely to download a second-stage payload or visit a phishing page. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://queure.ru/uplcv?utm_term=my+previous+employer+overpaid+me+do+i+have+to+pay+it+back
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087856b888c8---40516987698.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fbbc084581624cb32f59038d3a3c5cd3/94295215342.pdf
    • https://airbays.com/userfiles/file/10952838467.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9390e97da85163890c0135fbded13af4/89352955599.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/49756551263.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9757cddd---rovade.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ff4beaef---sapiguvodovuno.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a270b603---furamuvizunej.pdf
    • http://piotrkowska77.pl/zdjeciafile/patulewezurujoju.pdf
    • https://paklya.su/design/img/upload/file/56803934053.pdf
    • https://tort-art.ru/userfiles/file/pavaxipokulujezanagetapa.pdf
    • http://uppercanadatwocylinderclub.com/clients/877835/File/68285755261.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad02591895---nemuluvikipunugi.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa51188334---65179087592.pdf
    • http://fxmeat.com/upload/file/050fbd0cffc46386bfea549c88ab60c3.pdf
    • http://pho32shabu.com/uploads/files/movutuv.pdf
    • http://macautemple.com/userfiles/file/nemupu.pdf
    • http://koronowskasm.pl/file/12066421770.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b652dc760c3---8985730342.pdf
    • http://dokumsuzgec.com/userfiles/files/18425876622.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba87aa412---jodovizidewirofi.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d04f422d5---gexunokifisililiviguro.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f4587541ab3e4361846a2644f4e71946/48694470521.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b86d30928a---nokalanubixu.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727feea5e8a---fodogesi.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_off0000e718.bin
c181f30e4b621a0a3d3a6d9f64955c5f75265f1bc1e98c5e95ccef8884197c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 16424 bytes
font_01_sfnt_off000111c5.bin
a37f19e5ce99d5a7a031afbdda434b3b72fbcc44f89cf199341ba32d741b51bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 11180 bytes
font_02_sfnt_off00012bc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC0 16792 bytes

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