Malicious PDF — malware analysis report

Static analysis result for SHA-256 c487d41a9a53a3dc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 22:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3332e857235beb005a662f1ef7cf743 SHA-1: fe3f278bba64982f4ff17435c71d025bb4a8184a SHA-256: c487d41a9a53a3dc5804888b8d4c264fb2098a2047dbaab65fc3b12851289c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an intent to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=tendinitis+vs+tendinosis+pdf PDF link annotation
    • http://monkey-do.net/userfiles/file/zirixopojo.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/73280618532.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/kererazivodemiguneramoti.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/tepofejovepa.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/fajilawi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e44228d7---94763782452.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/1737779366.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c37544b1b03---rixesedidafubuxobabuwutup.pdfIn PDF document text
    • http://airsoft1.ro/files/file/77788271472.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/93450686632.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/81234159783.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/bezidu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5ad3ac4f---67381450631.pdfIn PDF document text
    • http://ccadl.com/files/20210804110327.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zapupoluwivozidusop.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/xoromokib.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/98721248357.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ea783c66---79011161316.pdfIn PDF document text
    • http://vina2002.com/uploads/files/97047798058.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/94093483740.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/olt8qkc7eo2lj38dhno2n89sod/xokolubusezetuvebibev.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/79486480231.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/23143300492.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ff6fdf0f5b665ea67115a24a8a4ab208/85215529994.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 16880 bytes
SHA-256: 969c9851cec5d3f9f5134671a11ebd82ef5eb2232432ec5128451f0023141758
font_01_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 10212 bytes
SHA-256: ae81364d4a6d3196ab270d4b43defc8a7b20b836cbdf68dba2dbe10c6736925e
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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