Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fa6d1222496e21…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 13:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b03d7f292fdf5702eb23b235016d7ac SHA-1: 9ff0c63ce5eb40a8142c5c8207cb1aa73f11bcdb SHA-256: c0fa6d1222496e215ce2d25af6eb6648c6ae19cebd3fd9c1a27a54d800d961ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=human+resources+management+in+canada+12th+edition+pdf+download PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6283b2b0a---78081653955.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/55260948611.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3c2ce1f3---26619603417.pdfIn PDF document text
    • http://ping-property.com/user_img/files/34293936255.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdff6134b---39045125036.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/nepudosi.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4bbcca76c41d55bb7fcc605b046f209f/43535977891.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6963dac4---vavelovujudonitixusajul.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4adc3b25be---2276882997.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zatugimasow.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095abebbea33---rawetolunoxapabin.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430202930929786.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4773c302---30432525313.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/migotudobevusi.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/naxuruxobemigubolexuradun.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/benubugo.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/20741665170.pdfIn PDF document text
    • http://huntland.hu/upload/file/89372697615.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/pagujisirusedesevideni.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gabukolegu.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/wegiz.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/jijevetusepilos.pdfIn PDF document text
    • http://albertaracecar.ca/clients/49797/File/lusukukojavik.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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 11416 bytes
SHA-256: 7df3d3f6dc4c8376259711a26ceab9b1fb035966bfeddb2f454ba4aa01efc9d1
font_01_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 18432 bytes
SHA-256: 6fe0e943616ecbea65a729ea9f1f89cf1cae058e75ab6712eae40fe252f1884c

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