Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0c00d25ffd1956…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 18:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 874321b3c18c79ae6ce51d8835df8760 SHA-1: 398cb86ebf59262c2d5fef0dd927467200cf7046 SHA-256: 1c0c00d25ffd19563084000bf4c02c2cf4e79c35a6de52d3ab86f3fc6ce5a8b3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kulazototinuromoxejemurer.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/92628207993.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/df34c68e7dff86023c3a25f3e0396adf/wobederukedetu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fuxogiriladuka.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/71698221892.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/gujewiri.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/8206f899632d6f1b335da88cc471e68e/42191533528.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210624201354.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/dorimomufop.pdfIn PDF document text
    • http://askaudit.ru/price/98886687578.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce29f2f1c---nokis.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/32c0de9c76a1e0c1d585029469fbd1aa/22325390258.pdfIn PDF document text
    • http://kientrucqhouse.com/uploads/image/files/tebulowuwawujagujumizi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3fbd3b9---12735917983.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7560691095---62947217603.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/42072282724.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/52069327455.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/46872021427.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac25fd8fc5d---42281743359.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/65293220716.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/5883589976.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/wuzajorunowibajivevugax.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1625216078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bose+soundlink+mini+2+manualPDF link annotation
    • 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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 10576 bytes
SHA-256: 772034c59091691f33e1bfd497e1c07b27882701e31ab65408227f782f345c7d
font_01_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 19460 bytes
SHA-256: 30375d2c79b9b757d48cc5c5d6e6bc15a78f9e075451677d7bd90b596b7f5d88

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