Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86b9a2f3359e6ff…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 22:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 0d621a1d2e942a5b40e53a4e4488064b SHA-1: bfab9fc33ab722853378d9e32e85cec4346568be SHA-256: f86b9a2f3359e6ff6ddfb810f2f8c0c05519ef90831a91e9639980caed5df219
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it impersonates a cloud document lure and contains a link farm pointing to potentially compromised CMS upload storage. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of external links and the impersonation lure strongly suggest a phishing attempt to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://gewald.ru/content/Files/poxezeso.pdf In PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/zalepewenovebonuvigepiwe.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sujijugutexuzolef.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/futifiresapurazobo.pdfIn PDF document text
    • https://adium.ru/userfiles/file/16727911484.pdfIn PDF document text
    • http://arucax.am/user_images/file/woruxi.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/mubevipalif.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/47646280193.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/ninizamoworilamepifivule.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c76ee1ee8e631463c3f3e25b7d557edb/tonetafatevit.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/74084750704.pdfIn PDF document text
    • https://netlandschool.cl/files/kamazisonabaled.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/92962972380.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/62123060134.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/36529648009.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/robotelomoxuzoziponed.pdfIn PDF document text
    • https://media-get.com/userfiles/files/sesefakebowojetibokenoz.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/89097877335.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109032342421198914zl9ue9xdxiy.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/33149972747.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/dimoribigut.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/pagolomituditinel.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/11464740668.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330e4b2b09b---wulet.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161377b623c891---pamojagebegoligawedebos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+files+from+android+to+chromebookPDF 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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 11052 bytes
SHA-256: a0be7357080ddb254113fbd75f897e77ef0a2a964ae466a36e9da44d40d053c1
font_02_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 17424 bytes
SHA-256: 1eaa6f79aca1319c7a3ecd0d9b616ba979c63aefe687c727efbc28f83bca829d

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