Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e316041847f6783…

MALICIOUS

PDF

90.5 KB Created: 2021-08-13 06:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cb76bd51a1d14cb49f7e95d4c29177ed SHA-1: bbe7e6814a35c452b60333485216a10c6fb157c1 SHA-256: 5e316041847f678361fea932cc502d220769ffb66846df892591bf8ec0821e2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=community+helpers+printables+for+preschoolers PDF link annotation
    • https://anglarill.net/userfiles/file/8749153694.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/2301441552.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086938d18b56---bixabinuxo.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/nupomajowevipibinijupad.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda28c826af.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/takerotoriwipasumopidog.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/61376562852.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/81009015599.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dnh2q02n7q7ninte6odadc7if6/kovenisewoxexufufowesu.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/84074837342.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608935afeda7b---50233708015.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/rawitemogasesotovuwaw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c6deb8779---83919294621.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d001c1d887a---69603915769.pdfIn PDF document text
    • http://mega.kz/media/upload/files/26977591157.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/91117036610.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/umvploe1565iu6edatc9sntmaf/73472639824.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba899d990---sivubokorefuv.pdfIn PDF document text
    • http://vodnik48.ru/content/file/vararikofexededikagofos.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/88105579047.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210528003842.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/77653877883.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/delutuvizosofeve.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef69b568e---zakorerapetuzujimo.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_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 11132 bytes
SHA-256: 53f52b67472de23d0b3fe737fd95371f20d351cd4e38fb662bf69a4ade336f1f
font_01_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 16984 bytes
SHA-256: c8fb9460984b171a71b5be61d29ff2c342f710d0965cd7c3d74b64e3e9d77cc1
font_02_sfnt_off00014333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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