Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd06aabf257c4b2…

MALICIOUS

PDF

81.4 KB Created: 2021-08-28 15:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fd2d887cf84906292e1e9c22b9ad0ef6 SHA-1: ad29e2421b0d8430a262a26a030758a8112bbfb7 SHA-256: ffd06aabf257c4b23f05f472d4f0de998e13a35472bfe8b2689cd9c1b8a126ca
204 Risk Score

Malware Insights

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

The sample is a PDF that contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The presence of a 'remote-support tool lure' heuristic suggests the document may instruct users to install such tools, potentially for unauthorized access. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2d53cb3fcdb09ec9a245caa175570a05/rodatol.pdf In PDF document text
    • https://bititechnika.com/uploads/file/56052445416.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/nulap.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/farupesusovanopi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/remafutedewogetugowa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739856db5d8---tawoworugame.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53de107a9---21476398405.pdfIn PDF document text
    • https://novsport.com/content/File/totawikisek.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2c6d7c20f---94388899442.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/wujexekagotuwubepupuvus.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/25971958467.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d6b86edf3a86d69fced10fcd5ec06ae6/66736543254.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/42826964332.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/26578957122.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6mae4ncv5ipi1etunlbt1dpk7m/zosatawixanazibi.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/k2c1lgf8t56el6g55lqm7saomm/gerupufivutopu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6neih9921u1mncttuk6o5vtr4f/75792763025.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a162eff1a76---piniguxejavinabu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079169abcd18---38495573478.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a67d593d---57011516586.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/wilasajikumubojesu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/97646221932.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/rumesiniximoviverobal.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a068ab973c8e0a4cdcf5e40e5fc9110/75317095036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=clerical+questions+and+answersPDF 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 10724 bytes
SHA-256: dc2959c236774a345ad03029657d674b4ec74bfde0afa76d0877963abd1adf68
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 17464 bytes
SHA-256: be2e8ad318129b40ca92b8af73468fde45eb2bf0aab9c46c890ccab95b3c0f24