Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e913fd79fc1b1b…

MALICIOUS

PDF

95.8 KB Created: 2021-07-05 20:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70b98a1c8b480d83400ad800c023a888 SHA-1: 64621012280c97bdd566f9e5f0277cab5224a065 SHA-256: 59e913fd79fc1b1b02b31fe448c72ad5e2b5538fd8ea902d9feb6c63a343c791
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 heuristics reveal it functions as a link farm, directing users to various websites, some hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 http://driver-jazda.pl/upload/file/kogogasejamevozaliwetavel.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fd7bf6727858d38b390ae6c1cee390e7/nivuzorumape.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/migipijo.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/81849914844.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/ledadodetiwakozava.pdfIn PDF document text
    • http://scantech3d.com/files/gazepozuzorora.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/mimazupogomarowimik.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f90179a2a125a85e43eb78271140204f/guvufalijaxezusujavesod.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/37271335853.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f064ca64---vutorikizovorowemu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaba896db1---kegujumomijedaz.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/dokuxilisifur.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/chjjcbc941c6ena9redhkt1ra0/48792653084.pdfIn PDF document text
    • http://praguetransfer.com/files/file/ripukubugesanubamugotufum.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zoxutipujedumajaxep.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7f97b5f6---rozevatagifaziwadojizimed.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nidenivasitisiwamape.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086766a825f9---80604182356.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/4508671839.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210624120756_7cig78.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/judejipemotu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/abd2ebbedaf250ab3a81c3369171db2a/19388896431.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce50b359e8---42388187780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=blueberry+coffee+cakePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10368 bytes
SHA-256: 2476f7a24a55d7d7530137ebe1eb6d8823fa1b7ae5f3672bc4a056ea3b209c20
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 18752 bytes
SHA-256: e0a4a7f0562794f271ebba3e2844ca563fcb6b393622894cc0229950a7117c12
font_03_sfnt_off00015bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC9 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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