Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cd80f941ccf66b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 02:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3f1d38b3e6f9955ef54eebec55bca67 SHA-1: 0c023ac8eeefaa3bd9b94d74c48df7f9be39966a SHA-256: f3cd80f941ccf66b52457bc3c282b081c8cccc6a6d714dd2a4b34a957d5b9889
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=the+glass+menagerie+study+guide+pdf PDF link annotation
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc8f5df319---ziwagiwatejo.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/32527348077.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210901111306.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/13887326835.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/21956942390.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/mefakipedamuzare.pdfIn PDF document text
    • http://fruitvita.com/files/files/23123963161.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jopejapalemikezabefarej.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/pororutebifisigisim.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f929950c---nivivunegaxu.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/liwotapisisifi.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/poxawefawuvaz.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/reviderikurok.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/jafarapibapuzoninonexa.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109010729599334.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d044ce8140---gegesiv.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/24687682702.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614982038f7b4---bisatasudatowotuzokigeka.pdfIn PDF document text
    • http://gerocuki.hu/user/file/58779169064.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/6040294501.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b37ac61b69---65045713052.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/52469110941.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/zidaxifosonilewutupenak.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/fegejelenivilifapuseja.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/96687110094.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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 11000 bytes
SHA-256: c89cf0f67dcfba9d5f991fdf9728fe5deed3fe3b619ce1d230bc88ca1e290898
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 18232 bytes
SHA-256: 1b2aad2dd5d364fe2c9329374b5c6aeca13ca953ed8d97f3c24d0db77c148c1a

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