Malicious PDF — malware analysis report

Static analysis result for SHA-256 4913cd6dd988417e…

MALICIOUS

PDF

90.8 KB Created: 2021-08-23 19:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f8d5716392d8e8e715f86289422d81a SHA-1: a40f78823665fca6de63cf96f947f07d566944b5 SHA-256: 4913cd6dd988417eb7e151f380d545911a1dcc702e8c47883c689070db6e9552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=automation+in+construction+industry+pdf PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/je62imteo6q788ce3d02bur54o/tawisega.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607585e2d0d2c---binasotodonesinovifajiwil.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/nosukuzebimi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/56mmshreknrlicra9nuaoa0pl6/gagovejodelelesibemigolo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608de63913db2---paxukawijefujakosa.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ripeninuverike.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be85d97bad5---59054162398.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/kubafazakopidobimew.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f9296f5a22a72e0cace13c730e0a86db/5183107027.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/42172497488.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d9f4fec8d02b3b5a5940ab97f3875933/litobisogukom.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/84674591181.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107557aa5330---tubinigudulidosorururax.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/h77n3s75qdngdpn3tjvdfd3vs7/varufod.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/395viujc7au8jogjk71005tkj8/76488277637.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/95798635682.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060708152627.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/46196199062.pdfIn PDF document text
    • https://lapakunited.com/contents//files/77180129535.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/98508149966.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050117242132.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/pudoxetewuzewuva.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/69279958576.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a10ac0965b1b90ef4377994be4c70f04/zerowigoruramotukinadez.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/sebaguvuwevirikalato.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_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10796 bytes
SHA-256: 926709f4cd6877f115719bee0e76601a700a981182a3cf3136efed47c6add1d5
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 17672 bytes
SHA-256: 97a8879050d2832c6064f4e3205ef8084486118b055310f14b91cd9ac11f881a
font_02_sfnt_off00014283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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