Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf91d1acf85ef4e…

MALICIOUS

PDF

108.0 KB Created: 2021-08-25 12:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d1eb0bf4d8a1d0b708b589941d97fbb SHA-1: aceaddb35c8abf48d34f86e94c3e768bd951ac3b SHA-256: 6cf91d1acf85ef4e124604572984c6035016d6bd53c7e2e782a28f73c4820525
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or attempts to trick the user. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/30aqquiltfktvr03cno8umuf2n/91352358949.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0c3qduv72bu5vpo1o0ha5tmr10/63546581281.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/xajis.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607035917fad5---45433922852.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/872f1d1b12eae352c3ece1da2d922f63/56740803645.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaf76353b---41257872993.pdfIn PDF document text
    • https://latework.cz/soubory/18882846464.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57f9bad10---pumeti.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/danofefanepapasuzuke.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xujekomerulixupat.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zazegizaburazew.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/susoz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8e49i3i48gq0tqqie1mm1hurtk/zabizenubodedax.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/41881789033.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f593857757---gogak.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ca2ad4ea---koxolelimig.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///59468965427.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/41063859862.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/68724750895.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/momapenizir.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/af1ef9587b6fc241ad9b6c7f1bb2b033/senivogufibanaxob.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/90891760863.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/xijulusefodebatipigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jeepers+creepers+on+tvPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/9e0d5b9d3068fede24627db94c042a47/87358157021.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_off00014274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8B 10124 bytes
SHA-256: 45bc94096291d1934b4dc05b556ee78760e05143118295266a7f6352985691d4
font_02_sfnt_off0001714f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714F 18620 bytes
SHA-256: 7028e8271c6819ef3c5b7057bd9b51146621277cf00b6a510942e91207b60b89

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