Malicious PDF — malware analysis report

Static analysis result for SHA-256 114f85ba74ed002c…

MALICIOUS

PDF

117.1 KB Created: 2021-06-25 05:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6bc31e9f62b927a2ac2831d24f446685 SHA-1: eca617d7030566d6a4dc2c175b50555c45923faf SHA-256: 114f85ba74ed002c1778bfcffb125907884afbec328357ea0aa0dbe816d65043
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. The document body is heavily obfuscated and contains metadata related to its creation by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4aab4d0aa1bc523110cef22a8dd3aa47/40655821483.pdf In PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a5371a7feeb32c741ea7381351374e2e/bovorijevajovaxumo.pdfIn PDF document text
    • https://angkagenap.com/contents//files/57868347044.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48140344916.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f8a59d58dec33f939dbb69dc49a1f500/notugo.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/bibali.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qnk263tri4vp74cne2e4jj5di3/muvuk.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9c9c4ec7---boxorube.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/21164515424.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e9cb4be2---33063554677.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/74f758305921f4dd98d7332a6bd60cff/gereputizafotabidesis.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/zusoxanajower.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cef47986814---83394839006.pdfIn PDF document text
    • http://allasclub.com/campannas/file/mijuziturekopa.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/24002212427.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092432280e1b---megadixix.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd18c9816f---89734301963.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094130cbfb---99795008266.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15346c18ed---tiwuxamebumojamedamuron.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/46210634525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=husqvarna+650rtt+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA0 5004 bytes
SHA-256: 0c97b3ad814ac5d3a6a35c8e875e13b8d0483db3f5f13528d1e8222b089ac35f
font_01_sfnt_off00019085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19085 11872 bytes
SHA-256: 425f93af82c7826d76cc5c4be4f62a987d6fe91f5371748b770bf7667eaf9012
font_02_sfnt_off0001b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8D8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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