Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7087baca0531a69…

MALICIOUS

PDF

74.7 KB Created: 2021-07-18 01:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a72926df085a166c99f4ff3abf70b1e SHA-1: 5da9207047b5e4182446d8432cbff26445d86aeb SHA-256: d7087baca0531a69e504857b757d521b6eb8da6bbb63e07f36a16904b16f9abc
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to host or redirect to malicious payloads. The presence of multiple unknown URLs associated with compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb09fdc217---gikavopusovijoxodukowukot.pdf In PDF document text
    • https://theurbanthinktank.com/files/rubaximabuz.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/76290840101.pdfIn PDF document text
    • https://atl-50.com/files/file/wagozoserugesugo.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/437028421.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ca24b0248eb2db39ed9e3b77bd69f1b9/76461965494.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/lotirewadedasedotelenal.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/womifa.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/84533482989.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lb799l5hja575angk9hch9pccd/93485209510.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/32082308186.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/99cdafdff344a9fc4c61cb85e1ba1bd9/xigujakere.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/30231234980.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/latoragosevutamonojas.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/roruli.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b5749c810cd5499d9d1038763d0b09d5/69078962273.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/kisezejonus.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pidogifoxexelifufused.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210618_A17E0854D83D1A6D.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021592231249526.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/16758927540.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee9aeb767---15808472317.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5353d23e8---36289406184.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/tepoko.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775393d564c---nuxudujefavovajaro.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/289409503a6e70fc695c743b83b1640f/sopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=yeh+dosti+purani+jeans+mp3+song+downloadPDF 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_off0000bf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7F 11308 bytes
SHA-256: 635c0a72dc20a3a462a05184246b8164521debea6b04385bf444fe39e2e16041
font_01_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16696 bytes
SHA-256: 6cda898a82c803f0febe10b6347af8079567ba5d2ce6a2200c747c74763eee0b