Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f86eb0ebd4781ef…

MALICIOUS

PDF

74.0 KB Created: 2021-09-22 23:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 65a35fbbb98f9f995bead70b1641e90f SHA-1: ffd1d8adc938c671196d59fb650dedc0f14ad235 SHA-256: 7f86eb0ebd4781ef0ad78af3d1fa84fb6b919ffab74c0b30fd7d0f0bdccb1812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves directing users to external URLs like 'https://ketchas.ru/uplcv?utm_term=how+to+identify+my+phone+is+hacked+or+not' which likely serve as phishing pages or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=how+to+identify+my+phone+is+hacked+or+not PDF link annotation
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiweduxeletuji.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/mejoparidogujumuf.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/gosegotuvubonuw.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/sukaxufafufavu.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/92928538529.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613694814cb52---gepunuris.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/razesatumuxisusodubuj.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nanepi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2524c087---bejeduderozisewowefe.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/sofodawafixumasa.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a18d6383ec6cb6734a36aef329c1b25c/kigipubinobozini.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/22069890256.pdfIn PDF document text
    • http://newmob.it/userfiles/files/91995231623.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/5696153584.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/14052115795.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/55173328797.pdfIn PDF document text
    • http://jadeite.ru/images/file/34514879890.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/guteparidarupizikux.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gapolexaniwugasew.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/kuledik.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016050641.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/89057217116.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/bixezewi.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/bokiga.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b18718aee0949624f68849adb9be84a6/timodogobesogifosavip.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/mudabigikoto.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_off0000c1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DB 11124 bytes
SHA-256: 0e0f3645b223b202a26f2fd324683208bdcef58771f9b8e6dbc7e2bb75449a54
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 15304 bytes
SHA-256: 2398ec7d9b7b744510c8d668e6679cafe0124a0960d08d689faf041afc94f392

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