Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a9937a440cc732…

MALICIOUS

PDF

89.7 KB Created: 2021-09-11 13:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c19e2a17549681947abce3513a42aa4b SHA-1: 94612242227e8bc35703dd14f560eabab62d37fb SHA-256: 98a9937a440cc732a4dde58449132dfe264e727ba7d74653f610ad8b5bec87f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://himalayanwanderer.com/himalayan/userfiles/files/dizosej.pdf In PDF document text
    • https://la-klamm.org/Files/files/3279839117.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613698650777d---35076599230.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/dinavafiregaxupezol.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/92659274915.pdfIn PDF document text
    • http://alltechsro.cz/files/lujulewuvepujegijeji.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tokereguzuriserumuzujanib.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/puvemesetikades.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/48668839577.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/10140693542.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/85774753951.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/saxetejosejedetabi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e14a975c627b323e279e282d92918078/butepipiwabijaribawug.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/41151217063.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/fizojuxigaridadew.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/metikoronan.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/1557008897.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/fejibelukiboripujawonidud.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/74986542514.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xisokibipisazu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398f34bd423---32686058650.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/56541383629.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/gusesewiluga.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/pirafukimipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=karate+fight+game+downloadPDF 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_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10708 bytes
SHA-256: 2b4be3c9d1e0e042ca0feaa44821d59d8023d8a0b08ef1a4c822bc9eb7ec056c
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 20596 bytes
SHA-256: fc9a1a3b1e11a8c59bfb704cbd8cb0e373bdb0c88acfb908a62b4a4dbdcbe22c

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