Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31c9b5a9ee6eeac…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 03:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 164d810d71e787e63d8a5f32f647025e SHA-1: 6e844737170e961cdb9d7b4f3b78948052f3ddf2 SHA-256: f31c9b5a9ee6eeac058059680c79ea7cd113b8df368023c4eff909a4bbca8893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://cambresisemploi.fr/ckfinder/userfiles/files/situzapatovujuguzi.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f6530ded36---juduginu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2199c99ca---18962244159.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/52758762404.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a55402c38df---37941752785.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/3946090694.pdfIn PDF document text
    • https://luminex.pl/upload/file/minosoporixugo.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/81920411939.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8340385f50d37c2640b20eb43bf38231/jobuzigi.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/33591024650.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/69604438356.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/naafmgb2bhrgg402e6rt4uifc0/78615271302.pdfIn PDF document text
    • https://educhina.mn/editor/files/venunavobeg.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/21635870430.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/78539776379.pdfIn PDF document text
    • https://invest.pl/userfiles/file/94415313795.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/24423fa83caae47cf91a552e350d9b74/napererola.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c3354294be7e1902f02e86070b5c91ae/gosajugibivonof.pdfIn PDF document text
    • http://allasclub.com/campannas/file/lejoxupuvoki.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4e798704e133c1e3753125b385f7b2f2/30643011446.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/65202457838.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/24644620511.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa698e5c2e---dumofolaniduxomuvozomal.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46dca19cc0---taduruw.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/12381a642f023b1d16628b1c56618268/guvawitakolelasidenoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=funny+reply+to+i+love+youPDF link annotation
    • 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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10172 bytes
SHA-256: e5a5b3937cee4b66220bf638e79c213b86936e8c4b741930a0370043bb352632
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 17652 bytes
SHA-256: 881057b24d44b480eeebedef1d59b2f423936d56c74a5f66e8108483ebe72bc7
font_02_sfnt_off00013425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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