Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80e5bc484422dd4…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 01:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76cb42433421df3b936c33bd14fe6d12 SHA-1: 06c8326ff3b79be7abf155812acb17770836c797 SHA-256: c80e5bc484422dd4218a33baa1e34f4b08c774f09dcbc540c9b0ce0d69b38a61
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely to facilitate phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c69848e2c---woxaxejasutatimuluzuvide.pdf In PDF document text
    • http://dobrasekacka.cz/userfiles/file/35932456117.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/7786573182.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/tanojel.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701e3fc9a2c---54694283826.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160868876980e9---83658778967.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210721_211731.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/74379300774.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/81721927068.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e798775e1e1---xolegugojawomugulewavifa.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/af27095f61e314f165c52b785153c7fe/vepukifokesoxidinamawo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a3d21a487---6121405862.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3a92c00732ce3b4d9acf0434b8053a09/67017338356.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2d678c73e18ec81a1ca0f81c41fec7f9/591283807.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da561e5a513---gawumosakikenopagoneta.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/zasarapepapunizom.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/gakerizu.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/78816371281.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8bdbf315764e72f4b65ecd914f388418/23159673503.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9702f39af---wekufibivigugipowekunap.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1v2g7kmv2kkkcneqd7pqkl44hf/lemisum.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/lalorulejigalikawet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=completely+fed+upPDF 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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 10276 bytes
SHA-256: 9889cf795a38a26209127bbc5500ac74c0e06690dd352f4b88d6b51de9efc165
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 17192 bytes
SHA-256: 0761c3512c735c18f0d2837ec766aa58b7df3cdbbc4199b57a1dc80371eabd13
font_02_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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