Malicious PDF — malware analysis report

Static analysis result for SHA-256 31719b251817b027…

MALICIOUS

PDF

95.1 KB Created: 2021-06-27 18:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c4e240fc7cfced3ca45b1b780887bcbd SHA-1: 1b3dfcceee5d9fe7f6bae9a5b0e9d9f2d74d43eb SHA-256: 31719b251817b0277350bb7d3633e56598068cbab361021f53f6437c67950e98
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan activity. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drafthe.ru/uplcv?utm_term=main+characters+in+canterbury+tales PDF link annotation
    • http://xinyaoqiye.com/upload_fck/file/2021-6-15/20210615144624639152.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab5381c41f---54738798961.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce88d8783c---kanimafenadesog.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/53968458252.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/i0stmmbebvtg64gmp14ubl8lpq/pevadizavexebuwuxuniw.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jjbngjfsuvahc0rm6lrlmanjp2/kusagiselirimamotagerap.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/41904397537.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/98898816810.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5376778e---dazojokekexugirovu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4b0f48dadaf3c17f3d37293ee1f45f2a/zabaxizos.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/vokabiremeveg.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210607202804.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2dbadb7bf---jixoj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/d6vnrf5rkp8rl8gchgqs7asecs/tejoxogegoxulonakibu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4163bea7e---logivopunofiguva.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1613736517.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/70e82ae7cc4faf62cfd1a9c0c49a2c4f/95027376399.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/belaxakulodudamarujigevo.pdfIn PDF document text
    • http://hkalc.com/userfiles/13341893828.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2ffc0efa---wuriroxafubomo.pdfIn PDF document text
    • https://aokman-drive.com/d/files/davedafu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10556 bytes
SHA-256: af5e161425d276dae4c64593b764b770b6a3274d7993f6d4e60e810177249a40
font_01_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 18732 bytes
SHA-256: ec1d376f227f1d3eebe17fd0c255efa9244b753662c2559f45b7996ee9060e35

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