Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7c52208c223181…

MALICIOUS

PDF

90.9 KB Created: 2021-07-31 17:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a36f161fadcd104b451f6b4ac7301d89 SHA-1: 3e924668117c22b824af190feae16a9f24793dba SHA-256: 1a7c52208c223181a45e8e2ace718ec92a6edfa7df9016189cca2aa7a5fbb483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=financial+and+managerial+accounting+chapter+13+solutions PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e3fe737f---xunepivefupiz.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/wagudemokusevire.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a645ab584e8---lovufodekugamis.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bfc8c1d3---lazotifuxonoluxur.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ee556327e07bce9fec104cc9b7e0e576/51216121392.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/dasixavakowug.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/89745393216.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/48756674528.pdfIn PDF document text
    • http://salkim.com/userfiles/file/vibebezivubutopopatup.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5785c57ea5fc663c0fbd11e00b6063a9/55754440823.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/62755556369.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/wuwas.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/62514073550.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/18470873102.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/1277394530.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/62044686289.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7c641c13---74033784919.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8002bead56---kobaronezod.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1976bfda---topizexiv.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/jametamugegesosebiwuda.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/kelipa.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76242230174.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fb43120e0d6---sevagewari.pdfIn PDF document text
    • 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_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 17176 bytes
SHA-256: eba6e5f27306414b54f4740070b997c3cc5eaa10ff78350c0607c25dfab02c6e
font_01_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 11260 bytes
SHA-256: 0fc4bd036c7ddedb195dffbc09c1273153e234ceda5fc753daba8cf35f740c57
font_02_sfnt_off0001440c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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