Malicious PDF — malware analysis report

Static analysis result for SHA-256 8927dd1a6efc73e8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 03:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5aacfebfd439525afef2e85dd85b517a SHA-1: cd2ad658565871f9699fc53311eb6c5869803efe SHA-256: 8927dd1a6efc73e87b537a68e2e127e75a0d8f4dd9f4333e23da0d2a408cd6ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URIs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate an attempt to lure victims to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=electromagnetic+theory+book+by+satya+prakash+pdf+download PDF link annotation
    • https://ekransamara.ru/files/pukefijejowa.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/daputosudilawav.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/zisajesoton.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b597dda2f---dizudafeba.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/40514999654.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085179a8b244---bimadeko.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/lunadifagefupuxajit.pdfIn PDF document text
    • https://termoformat.md/img/files/mutusopanejuxerutiromegup.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/vatudoj.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/sazuselaraxixuv.pdfIn PDF document text
    • https://quizai.com/uploads/files/46292949744.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/sixaterufokutexulodus.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161005120e4328---vagipajadabupug.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/vujisusejibovav.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/87302626338.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210609144342_kutknm.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6288307458---23987925937.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j7qoeci94ji9ap2uublu6mc2nj/26646301276.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/72512238092.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/1866707226.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/14109997702.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/16815509859.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/abc5e2901c66e73e11d6bbcef0529a74/129756094.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/36784945294.pdfIn PDF document text
    • https://equalland.com/uploads/File/85229857106.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/wugadixe.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_off0000be4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4D 17260 bytes
SHA-256: 7c39336bfa4c4f085b03e0af39dbffc9b7d75da061a248da24c09b4db0f76721
font_01_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 11480 bytes
SHA-256: 77775ed3e3f4e23b10d81bcd826a06920dbd48696591c3a2945b92b7d1886ad7
font_02_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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