Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1bec7ba320f49a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 22:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 835fd2fdee6b5e61f94171494522b8c5 SHA-1: 193b2da6d7d61e59886c25522bf5a04b2491f919 SHA-256: 8b1bec7ba320f49a75d513cb1a3d059b1ea75e2960cd2a08c248d64fa9cfc09c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=safeguards+of+liberty+pdf PDF link annotation
    • https://noithatkuongthinh.com/uploads/files/90446871332.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/wemokixebedi.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/83227542557.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/pawanijediw.pdfIn PDF document text
    • http://z500.si/files/19076103528.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vutufuwojawijap.pdfIn PDF document text
    • http://askort.pl/Upload/file/14270456431.pdfIn PDF document text
    • https://timminsrenovations.ca/file/Yc3ZuRGjedjwZUsY.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/27583750406.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c78af1dee30ca3d46507910e1f0421e8/55906587290.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/72295753967.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/db2c5cab3309518b3387e58d1b93ec7d/lotinugamaboxikuzaxinawa.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nntadg0cicj0j6qvpeov4ndg0h/45912433248.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xisavuma.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae5ff31fb---33922176693.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/83571503411.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6forfs0bm1irvqcigmoe9qupsn/63952120671.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/91eec3831bd9e8d91ad99a7e69540000/pubavagatebi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/99d517ccc59e56176ffbe06538c8a0aa/jegodugizowakexaradobis.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160887b782dcc6---27802682297.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/59574352197.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nemubugizajuriwozutiz.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/61970928864.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d857cbe97---67163628871.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/pirulaxuxidumugepitot.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/16162234071.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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 18024 bytes
SHA-256: 8955504c490a75854e20c63df4dc436df17fa42e3fe8039cce46c2c590fee92f
font_01_sfnt_off0001172a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 11000 bytes
SHA-256: 37687d67975a50f3cc4a55d4b28d0209f16b08499471c1c4fae33e1bfcd63b67
font_02_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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