Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0efde51719a094e…

MALICIOUS

PDF

90.2 KB Created: 2021-07-27 23:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23aafa667ae9dac9eb734da4f387cab9 SHA-1: 54d0b02c024fa52795782ff27d618b892e255be4 SHA-256: c0efde51719a094e2cf3c9bbff85adc44e89db0277eac90046ad3e0b28dd5c1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or visiting phishing sites. The presence of multiple PDF-specific heuristics related to external URIs and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://contabil-fiscal.ro/mm/file/27042175564.pdf In PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/zewomadonefuzasanemuperan.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/bogebidejofolajimutamisa.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/52902254887.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ecff114c---lovukizadowutizi.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/bimavuxabukokopisowe.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/nurobag.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c519b0c16---mibuvevezelixuka.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/3820552487.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/navurinu.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/fitarisumudesezaferat.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/dunetuninit.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2d94133a3924186e7ee5ff617168099d/68149437449.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/kobixabikumunidit.pdfIn PDF document text
    • http://billsky.ee/files/file/80875452065.pdfIn PDF document text
    • https://giustofiori.it/file/godokezenesokifewi.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/witiledebugilefo.pdfIn PDF document text
    • https://geniodelweb.com/file/50880531228.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/tofevarapege.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/17412841177.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/fomujedisarix.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/sufek.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/zabidaxoxubor.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/jalojewijalifobidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+game+captain+tsubasa+ps3+for+pcPDF 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_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 11464 bytes
SHA-256: 775fcc7f3dd0139fc5c45588e73214cdfbc1bd37790beb1a28188628e80f2d5d
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 17156 bytes
SHA-256: 81af34d4a11686fd81db4d85fa6e5cc430657abf2e199cf7a31083f4b9f628c0

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