Malicious PDF — malware analysis report

Static analysis result for SHA-256 77417dced74550f1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 01:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d9a07fe440cd227803d337070b053cb SHA-1: fe72d7c41e5b061201e678989c806f2d83830caa SHA-256: 77417dced74550f186ea9c48bec619c20dc8129d3b974568e230421b855ffbd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://srividyaastrology.com/userfiles/file/32236272954.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/vixugenedadawitet.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79fdc70f---50131361114.pdfIn PDF document text
    • http://clickvay.com/upload/files/76802373523.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073bca7bf876---34468358936.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fa6a30d4e---48409816592.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210828/files/20210828095629.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/38597513157.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/28567492340.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7plilsms29avcnnttbvcm1jb4b/gadubigisopipuvi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d687a5b00b---83222263384.pdfIn PDF document text
    • https://khanikango.in/file/31182624306.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b2650d0f3---zinudobizariso.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d9c81f02---kesupiponemavibat.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xixijugetupisigebipese.pdfIn PDF document text
    • http://ruihuitax.com/files/file/58871089593.pdfIn PDF document text
    • http://carszana.com/image/upload/File/gilojomu.pdfIn PDF document text
    • https://ancoraeducacion.com/images/digodijozoperimomep.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0c3f7d8dc6ccb94b8202900a3568911/64179808239.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/2m9102rnvelrcq2hctk91bblb7/zejaxamaxiginavanoze.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/34119315212.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d94ce89fa0fc747c8da8c06b02b08c7c/65368793082.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc00947e0---genadabumeluvan.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/21857168606.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a4301b7d1abdc284cc7da2cd5b3226f9/12554870243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=clasismo+definicion+pdfPDF 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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 10612 bytes
SHA-256: 1537984fb1abd9014f3d30e2c52d14b30090d198e770d89943b5fe68f4891954
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 18572 bytes
SHA-256: 0dc4a1255b91e9bfda6cf63e7404bda48ec0569812e3c5bc5fd00728bdb6ba0c