Malicious PDF — malware analysis report

Static analysis result for SHA-256 016be2d34a6bce7b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 23:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7042d3276b4e38e5c289ad9cc3a637ec SHA-1: 5917d0293744ff3bddc13a0cb26993052dbd0266 SHA-256: 016be2d34a6bce7b7c9d79800aa07c5b23b600697fefff8718b5eb080bc1d127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URLs, many of which are hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', suggest the document is part of a link farm designed to attract users searching for software downloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=nuance+pdf+professional+free+download PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ad05536a6c3b0d774fa5758785381f3f/nijomexedonorawazidebobak.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/gezilusosefedufofaviso.pdfIn PDF document text
    • http://kotolantopeni.cz/file/kaxubelijipudot.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/biduwoteviw.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bec3fb9c873572a7fe93d50610e16c31/joguvotalonetunopawuzuno.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/naei9snkdelu8ikmvdre58b142/93308629367.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160855d4622587---70155396595.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/licq0nuj8tpnke7rhvptpkp5dh/92086108584.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/11129637850.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hr4llm3har20140obs2mlpge16/vixedizatalazozibimosuf.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/wetivisoludoba.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/51760041715.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/300554557220.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a54425c7234---dotifejijebutulekefa.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210818_6AA232F89C392390.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f4ef6babafa57c31be07065187aa61a3/luleba.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/51582212166.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ef34caa79a6c2920328271dfe0852440/99108352.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/32248208958.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/tuvumapezepuzamejejo.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/oq72df8bi5ojerok78ec09i0o0/zazik.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fc54b9ed---69063113024.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/24630650548.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/luraxemozobarozer.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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 10676 bytes
SHA-256: 2b86ba3ead3cdc37d6031f3369e91ec6ed50346b6cca29ebb1fe7c39760fd529
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 17260 bytes
SHA-256: 6e4e8d9aceb23849d5b88d4711f59adb1870833813d8aeafda454839c69a31b5
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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