Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8a06348d97b385…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 04:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a41bbebe669a2c5f88f63a9e076b8762 SHA-1: 35f876cd6a1b997b6554b029027701dc70bb6add SHA-256: 0f8a06348d97b3855ac391e0a0d7ad844797f4a4951add867855d173e969abc6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'SE_SECURITY_BYPASS' suggests the document may also instruct users to disable security software, further increasing the risk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adriennemason.com/assets/files/11346858118.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137075422807---935182555.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/74508871005.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/69164300472.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/50975587113.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/24971555735.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/senakebepisigemurunigofi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd25d03618---29815320002.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/13668055839.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/39216870178.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/vuwugo.pdfIn PDF document text
    • https://htchninc.com/d/files/wibopakorep.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/vimedinozakazobivobapi.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/tabon.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/44156200563.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/laberavesatove.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/68074988761.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/xewenelituzazolojeluloxi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/80f429e22e13efa6421a7f35e257b1fa/49007871163.pdfIn PDF document text
    • http://ccsl.asia/files/zuwufevixepofizal.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/refazidov.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t6j5imrhhco2adoa9j1snqjlc1/suzukuredunefezezavusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sims+4+all+packs+torrentPDF 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 18344 bytes
SHA-256: 1ea3d3b95c80a2f21ebf100a098a6822991f0a4ffee476f5f83e33635780d814
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 10780 bytes
SHA-256: ff9b4a77e320f0ee61a35bf0bd4395aec5e170490d6f4b6778b649ba6bf6fcff

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