Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68adecf049b4d82…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 16:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3107bef2302ad8142c88cef9d9b0bb0 SHA-1: 6f76049013230ab7ad4d3ce011db336738276934 SHA-256: f68adecf049b4d82ff7c7ab0ea0424db9cdce3f42223a2c92601b5d72c541672
204 Risk Score

Malware Insights

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

The file is a PDF containing multiple links to potentially compromised websites, some of which host PDF files. Heuristics indicate a 'Password-protected archive handoff' lure and a 'download button' lure, suggesting the document is designed to trick users into downloading a password-protected payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/63db5553b40b655dda352007f196bfce/98937025859.pdf In PDF document text
    • http://watdoenwevandaag.nl/upload/88786511220.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/sumavapop.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/vomuweto.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/nemato.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/nalufaruxuse.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/pisafivuvaxuduwezotegupe.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/toxagosizuxagaveduzefuj.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae4ee9c16---65933822963.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/28627515600.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/74596435712.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/72udi6huahbaglds6867qa887h/9359796141.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/22001089285.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/92122432367.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/dalorotuxebezebitemav.pdfIn PDF document text
    • https://terracell.info/images/file/24742975482.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866b8ad8c0---62316684933.pdfIn PDF document text
    • http://chamdure.com/DATA/files/32962908329.pdfIn PDF document text
    • http://julianina.dk/upload/file/faxanenufosugiwififapudi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/24338844796.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-8-2/20210802190318992296.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/bokeki.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce11906b4---56176212348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=decrease+pdf+file+size+freePDF 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_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 18436 bytes
SHA-256: d145a6222e8cbaf2f27217e3a379782991178c2d00653928abf74d6acede9205
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10352 bytes
SHA-256: af924da822e3e7a8ea997d2f62579006ab2cc895a73421a02f7b119af29a212f
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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