Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d89f0bb8e6aca7…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 08:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40baf7bbc608fb1feb415b268d043af6 SHA-1: d0bac94658d4f20fa296556a547d67a0a43af8ee SHA-256: b6d89f0bb8e6aca7b0d5b5c96458e6af3b4d68a2483be1b5aafbb5b52afd0d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate a link farm structure and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. No scripts were extracted, but the overall structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dydlhx.com/upfiles/file///volepugedonizuvuwomiwobe.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086782aec305---kafibisozigolujevunon.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/24741683838.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/lerixobivi.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/zimokukat.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/oemjrvpmjs7of6uj4at82o9343/12517429346.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983d6e5f04---negevodefovijusoba.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608310050a028---31720153733.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kotumivoxowusewafoxetu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b87f37b3---97455321311.pdfIn PDF document text
    • http://jarosi.hu/files/file/67389157757.pdfIn PDF document text
    • https://synersys.fr/contenu/file/21937959505.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/66176594533.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160998623600ef---nakekedotuputoxuxopi.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/fipikogajojewojosufub.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/jamabapapazedapukidejazi.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/wusujaziv.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/26840677582.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/xuvinoxun.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dinifegunam.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bf507e95d105c8dc14c37c2474d3113d/32886451049.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/23895617960.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df96ad70995---6313978307.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121883b06a7d---11545929869.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/motogadobazatapino.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/dewikojitojavumorovijedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=honeywell+t4r+wireless+programmable+thermostat+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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 11208 bytes
SHA-256: 900eb8b403599414f14037c7fdc46682a0ecefea8e17fbfdd6b4c5c49498bc9a
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 18572 bytes
SHA-256: 039de68b5461872ccb808319eec09e3111b21611d9d306b28881663dc633de70
font_02_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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