Malicious PDF — malware analysis report

Static analysis result for SHA-256 140662ae6547c285…

MALICIOUS

PDF

87.1 KB Created: 2021-07-12 16:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0493bc48d79575afd62be99bc05cce83 SHA-1: e5be77162f2ed4eca604dd8f14b3dc76a05edd66 SHA-256: 140662ae6547c2854cabc9b06bee0c906f771eed634b15e90e9c353ffabe865e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=how+to+reheat+cooked+steak PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872f2ea51bd---kuxefogopux.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16223809752038355822.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/83383402401.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kiwekeligegewimexa.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/20815478583.pdfIn PDF document text
    • http://vejwun.cz/images/fenawo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/vanunamuvodaxar.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e17b2c209---zogof.pdfIn PDF document text
    • https://advik.net/userfiles/file/7656074997.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/9d051ba0f986b4dcb45dbc96f885e73d/kapapuvuwuxekedusureguwud.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/zisulusikasavepote.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/phan1ndrkiimjgv18pmnthnla6/gomurib.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/6829463287.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5cb384b56193e766197056a3f53420d3/tegidoramojogogurafof.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/beponugudakudawozo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991688be301---487004265.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/bawopibod.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5e0uket8vaam6kp7ub5smjsdm0/buxudut.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5db25c0f---tirina.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/47387069643.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/foxuru.pdfIn PDF document text
    • http://yuhongzg.com/d/files/25460744798.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4875d42c60---jiwujafo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5aa38b98ba513b344a36340476305b57/bitijufexutedudawoxufoxel.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/2944542461.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 10396 bytes
SHA-256: 0a1818d91ce07294d3fa7a926aee115d10a3adfe7094e2e421892a9c3fd45e3f
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 17600 bytes
SHA-256: e2f994c07fe4fb4f1e769de866fff9c3c425b5d4739dd1c1fcd22a63410fe88c
font_02_sfnt_off0001370c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1