Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9dfb5b67f2d1be…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 21:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09574ad2ee421b4f7c59d5bdd7e35313 SHA-1: d7dd4031eff4aba64e5791fbcf0347fd3572b2c4 SHA-256: 4b9dfb5b67f2d1be5e06592a7606937696745a0da7e6512feb8e7fe28d1687b5
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern, likely aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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 https://queure.ru/uplcv?utm_term=safety+management+pdf+download PDF link annotation
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b770206cb22---62637690003.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/wuzekujisivelikumidemopid.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/fokirufefoxalo.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/23713584313.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/15f7eebb52c80e69b295e1a1e3f7e4f1/worotawowipik.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc08d7a905---17625194012.pdfIn PDF document text
    • http://dmkert.hu/files/file/51519212150.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/07137de0eeb2d12283f1db8657a8a997/tewaferuludarifetarutepum.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/188ctlnfa43ubfaetn6e10itid/perululaxodob.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/32576226972.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bk17nf4sgr1k3th3qbdd2omtq6/vanipinukotusoduges.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7orevdopkk060a4lcgvqucts6/12898480626.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c369f8b62d81d9739304e2e4c3c9f361/wofozesorawamibabizoseviw.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/13579385653.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210703014745_368x7y.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32f538c9bf---84341693088.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/kuxutebutofukomi.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/nejusubaganil.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/56826194564.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5356f1334---48951737670.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160cda07b0c9d2---11813797162.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/97533563863.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f58f94a87---gavobovesonaluxutavezek.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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 19208 bytes
SHA-256: c2b30318bdfa3485c0fc7f60fa84f9ef4b6230f3fabf943ce838e26a051834a0
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10756 bytes
SHA-256: bf9f09b27a5b2a4e02d15fd92d064416737251a98e9a392975a3eebbd960d377

Open this report in the interactive analyzer, or submit your own file for analysis.