Malicious PDF — malware analysis report

Static analysis result for SHA-256 1687219b98935b54…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 22:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca74ad386a2d569c2fe3a075bffc59a0 SHA-1: ad1203e8051f24d4d8f5232cadf0b3035227cecb SHA-256: 1687219b98935b54690f8e4f4b8104957acf5458b3a4c8125163fb1235d4af7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=rayman+2+android PDF link annotation
    • https://bharatceramics.in/ckfinder/userfiles/files/72515588719.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lopogilolopa.pdfIn PDF document text
    • http://keitbg.com/images/files/xudojojevufemesasaniwozo.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/wiwemebikabikuwefomolixax.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/44173645285.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/35240106365.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/58067043566.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/25846827920.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/jupetufusolizibidoluputax.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/78984524022.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vezewedepu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/lidanufazan.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6a4db2b8f---dikepunagabitimew.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/levusifukewufulenavez.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16153000b1821c---fivebogefon.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135acfda0d7f---xezuwufagepus.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/gobofoveziw.pdfIn PDF document text
    • http://moretonassets.net/userfiles/dukusuxasi.pdfIn PDF document text
    • http://midospa.com/upload/files/xarawinokizimifuvevu.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/boxajetokux.pdfIn PDF document text
    • https://ip-pharma.net/data/files/8180135970.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/majugubusarimumimi.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/031014135656.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/dowajusenukepajokeg.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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 19156 bytes
SHA-256: f700392f49ed83c7c466f3bb800ac42b327f6d2a85951d2aeb59bbd4bc237058
font_01_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 10244 bytes
SHA-256: 479e1077e6cbf4d7ed887dd0a592a66428a9a764e2fe807881a797d293830047
font_02_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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