Malicious PDF — malware analysis report

Static analysis result for SHA-256 b743ceb2a38b2147…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 06:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95978024ef1383d5058194e66988d4fe SHA-1: e180bddda3fa93f97c7bc12badf3f9d8efc76ad8 SHA-256: b743ceb2a38b2147f4ebcce5addda8862c378d55143d7e2417885e4457740197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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://coretry.ru/uplcv?utm_term=mobile+data+saver PDF link annotation
    • http://stylowa-pss.pl/userfiles/file/827675145.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210907161300.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e01e3c91---67635707880.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/45059840694.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/41946188475.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/jujabaragepuraraf.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/besigaseromipuxabaji.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xarokisisinidis.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/77882552004.pdfIn PDF document text
    • http://dezis.ru/uploads/files/vopajajolorabam.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2e83da699d7dc787e8b1fa5084969ae/43716198775.pdfIn PDF document text
    • http://beiks.info/public/file/31542080413.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/49818740435.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/zujowaxixojasejafixux.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/ginufuxiz.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/3060831836.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/49586591312.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/74430845893.pdfIn PDF document text
    • https://istanajp2.com/contents/files/6335755059.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8229bda2b09e911e5bb8713902827e96/xotenegevi.pdfIn PDF document text
    • http://goref.ru/files/file/nobinokeribotukoribex.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/sajudivabidogavoso.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210917061843.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f224ed597b---57820119597.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/71901503397.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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 10336 bytes
SHA-256: f0eac441b74071c31cc0e9846eca352a77f86585d855f84f3bee964d5a6af7a2
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 18064 bytes
SHA-256: 13153460415170446331340cb333d042c62e7cfd35e0e49691889118e7a39f7f

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