Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e6abcdc5bc18bb…

MALICIOUS

PDF

91.5 KB Created: 2021-07-24 11:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b4f0021f55aca47af01e9d0396483a5 SHA-1: 516911650c19e2f3941a5cb271962b4509170402 SHA-256: f1e6abcdc5bc18bb01e93cccb5166f65802d266f557d835d33865987f34d4393
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 a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ilmjlgnefrg39ud74kc9ll65bi/17977928637.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vasul.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/posebafajakapojepogapaf.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ph4s34kh5kmkto3aobe8fugqf7/97865624159.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/28792655068.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bvt44ed8gmj0pco2oaufec1344/23687112622.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/juxifewapiruwegawabege.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e8da0e02---xerekuvekoviw.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/o49ug1d5o0t124p3gbooc7h2sq/67334826342.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/bixipipezefowujadaba.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/55907367264.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf02c81ae8---71350972261.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce9360e7c8---fulijaxadevedeb.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dtmtq9inpj5ic1s7l3jt2gtpj7/vaxafobatakerivupopajiniv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kjn6uib6rfiuj2sb833pqksuq3/xeguwotitis.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/5096816281.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5e4591eb632b4240957384e627d6a370/gulegivaviluvaxiwug.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bb793f051bd2884339ffe128239e5c72/naziw.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/29412812871.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefa59a472---7011028668.pdfIn PDF document text
    • https://kultmotor.hu/images/files/29376842369.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0fe1a68dee42e6534e055ad9956237b2/85372552778.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607824ff02284---8906809145.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/38158441181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mr+president+game+free+onlinePDF 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_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10832 bytes
SHA-256: a233fa044718931026bd8e3de25b87699dbf438a178f9eedb93147c35d88e7d0
font_01_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 17556 bytes
SHA-256: 2597fa7e76276680869b9ff55234393c4760e173b8463e75c9bd067cff1183b2
font_02_sfnt_off000147c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1