Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b50c9a9f4cefc7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 14:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2a9836c28bd5aac8e160f18357bb97e SHA-1: 9a4c16db6744421845fde468ee427d548393fe29 SHA-256: 57b50c9a9f4cefc7cb5e571cc136d2d08486b8992b4188c2e009f3a1dda14ff2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=gran+turismo+apk+android PDF link annotation
    • https://firesystem.ro/imagini_ws/20252936170.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/22043804952.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdaea06b77---48968346676.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/21937926435.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/remogimuwonofebasasipukak.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/41895946987.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a3l6j1udegvu284qacr9h3ttgs/gedesopuwipusejopodiwewaj.pdfIn PDF document text
    • http://c-amc.com/upload/files/fizisogexawifogorufilew.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/taguwejudu.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/kirobigewebexodeveselule.pdfIn PDF document text
    • https://hsse.cl/files/kibopelalevutasarupil.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e9184a78a6da0a1e93c96024fde989ff/boxasemopajuvonovaguzogu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/sesetekonawolemogol.pdfIn PDF document text
    • http://safetruck.gr/images/file/gavibafi.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/29224711227.pdfIn PDF document text
    • http://kalikraft.com/images/file/62328829652.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/58182223824.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/kukosaxoduwoba.pdfIn PDF document text
    • http://aweibel.com/Photo/file/88052724882.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63701389906.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/1742490668.pdfIn PDF document text
    • http://packturf.fr/files/kalinubovozoxijilopenijuw.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090112544673499.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/36481649848.pdfIn PDF document text
    • http://usagimatur.com/files/others/pumosuxolalapepatizezane.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_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 20068 bytes
SHA-256: a09fa81bfc52932be8bf55072c0540840dbbf2eb24f0c559516e7fd8bb97bf37
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 10604 bytes
SHA-256: db4fd0e618ee416fd691174b131064855c08d6ddf8f5c7ef928b6b629523e88f

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