Malicious PDF — malware analysis report

Static analysis result for SHA-256 83656cb7d1e28f5f…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 09:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4922c782b85e0d2f11c4baba93c299cf SHA-1: 9dbab56ec5262580677b3b5b2194c452cee8e78a SHA-256: 83656cb7d1e28f5f93526c96863bc4e15618065cd762222e9d043aecb596978a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to various websites, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/63b977d89179b03b0169beebd745a94e/31961467973.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/59193427060.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/67032335280.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137570bf0e29---45546032663.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/11577647904.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/xiboxodarotirukera.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/74942524344.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/37823419286.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/31419037936.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210906_3478463B45E76464.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210912_181247.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/xoledusa.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/80677297090.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/xulugodunagosanijamo.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/letanuguvuzoxumax.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/15336684060.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/32450092379.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422e5c2f9de---10186370256.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/7818281067.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161450f7272129---bavuteparugewalimowero.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/88359031350.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/fexovuroveribidomisukeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sammo+hung+the+bodyguard+full+moviePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013754.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13754 18420 bytes
SHA-256: 86214d52a0a6395a5cc89f69dc884857f939bfd95818bfa317b410757707785b
font_00_sfnt_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 18540 bytes
SHA-256: f646ae71a2e051cc2d4c9ab1eb0a4018aac2810f8ae1a7d697239efac028fe5a
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 11128 bytes
SHA-256: a73430eeb8febbf3c1af2a548bf1f70249947dda3afe78234a41eb73a28b9f56

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