Malicious PDF — malware analysis report

Static analysis result for SHA-256 44eaf86f2d88fcf8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 04:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54968b7610b1679c1130994a8c0ba97d SHA-1: e1b35e78625a4f8ec86e70596ca946c57434e157 SHA-256: 44eaf86f2d88fcf829c4f251bb8b4532d69a9d808972cb117be8abbf34f63cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=a+quiet+place+2+showtimes+4dx PDF link annotation
    • http://ainut.fi/userfiles/file/65205286518.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/15447050234.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/68584907344.pdfIn PDF document text
    • http://fruitvita.com/files/files/nurogulebuzaw.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/27078992315.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/gowimujenuburuj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501afec2693---zusowunipinezeniluxejeb.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/26695563444.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/63398014833.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/84092647552.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/63802393451.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8fgm9fkmv0595k7llfub85cnd/90906387171.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/5482682373.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/58022358198.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/23752507551.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96e6ec6c7---96325955675.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/daronurid.pdfIn PDF document text
    • https://highrise.pl/file/8130899526.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/vebivonojaxirofanuwilup.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161314c2717cb3---783810361.pdfIn PDF document text
    • http://silver1979.com/upload/file/zumabatakuzub.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/88ba03d43162280264e6b5c18ecab15f/xevavulizowigase.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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 11188 bytes
SHA-256: 8104dd01724c9d55a987b2e4cd2bd298285b9cd4256ca7374352d79291680d6e
font_01_sfnt_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 17560 bytes
SHA-256: fb85f2fe59ee08835cca329a40255514223496f3d4bbfe8edb08487d0f2bbb7d
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1