Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78c1972d077e282…

MALICIOUS

PDF

81.8 KB Created: 2021-06-25 18:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fcedbc3419d43de69b324b0186a815c6 SHA-1: 609c4950b6e8c2a16f8f8baba900ae85908be74d SHA-256: b78c1972d077e2824406a0322fd6eee4db234b36baf7e50fac33417c02deb078
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress installations and disposable hosting. These links are likely intended to lure users into clicking and potentially downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2479

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160769de6cc884---kabovefawoxotawe.pdf In PDF document text
    • http://spreewaldatelier.de/img/editor/file/70031989149.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cea4f8f295bc03412a266bd2b0ecdee8/xomimi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9db717d74ffa72741f2aa6680e77eb79/selakixevazilarovederad.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f3224de7---vikokafejotujunanudi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8999f78ea8---915301883.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84784a91e5---99588705005.pdfPDF link annotation
    • https://xosobacninh.vn/webroot/img/files/76470294712.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b356891cb58---luxibuvowefezaxunuguwu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efd1c74dd---63115769142.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d8f1862f---84626296206.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dd328b435114eda32b9d0029e900f3d4/90459343324.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/du3hhoo1mth94gh478icdb0h2h/52484566312.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/xajis.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/9344674502.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/30282489449.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8c76fd4fb73ecc2f14b5be3337584b47/99844971440.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9376d15825c656b47abc018a780f05d5/19354244934.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/takenixoxunezewik.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f03c42bfe---pagupudosozosamejubena.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105082209.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7895511429---35540252912.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/vozosupepogamenupow.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/c2fc2a7bede3e275d3e0f0d9f09e045e/sijobufajemuwubokos.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/17351553838.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/ruditipanafa.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba87c8b94---daremasomeloni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fallacy+of+illicit+majorPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 10316 bytes
SHA-256: e867ba49f9e7d74a23c0b1f8c4f12cb3b6191e1cb243583732e58d9e05b9b57f
font_01_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 17012 bytes
SHA-256: 1d4564f9622f215eaee1e444302de42d310dc372e79ec4e180fed190ddfff267

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