Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce144f77e1c98a63…

MALICIOUS

PDF

91.2 KB Created: 2021-08-05 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2737cc391bb1dbbd6423a99de57dbedf SHA-1: e59ec54ca876c93b01d85573d1f1c395b7390aff SHA-256: ce144f77e1c98a633313fee7ac407b32ae6cf125e628a1908db84aed2130ef23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of directing users to potentially malicious external content. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=proceso+de+investigaci%C3%B3n+de+mercados+internacionales+pdf PDF link annotation
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/4mrcfvmar6ljmp6ds71hqj5s59/kodogesoworikezexusoteb.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/43455070924.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/sumetulevanijen.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/sowusesanigovotoroxila.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c7c02a0222d0a9f210dd3315ecb34d14/xorobizusogumowiwos.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/lubixikirulutunubow.pdfIn PDF document text
    • https://ikima.fr/uploads/file/32544592634.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/xekevunafizosoxafililufej.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xoboparuli.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160897003b4d1c---94658908865.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866acdb868f---wofefoxekamisuwu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbbd34cfb5---kutozak.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e697bd97---jejolozisodumeg.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/t3r89ef2clv0mbc9m5lekqvbk0/sexazizazilujoziwunen.pdfIn PDF document text
    • https://emmaushuis.org/pages/29359358446.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/14299345686.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbea0e2a90---fosodi.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/17129381502.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/78018518759.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d159d39e3---34935386835.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/giral.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1ecb692f9---birowupire.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/83938863716.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/vagegababaxuk.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_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 17776 bytes
SHA-256: ea805c2c45ac22c7ed0aa69afc540b35cd86ecaf49fc2c425df77d61bc033e87
font_02_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 11168 bytes
SHA-256: d02045f538f960f3c652c06f443c669988d75f3bdb5225539f2fd761beac2aea

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