Malicious PDF — malware analysis report

Static analysis result for SHA-256 f011382ff1f109f6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 12:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3824e1638ac2fda322d6d0a3f9f2b13e SHA-1: 6151e2ef2ef1546d10c31e14ba6dd177ecfe8a9b SHA-256: f011382ff1f109f667da2a19469a0e73224d76c70eca37eb05b0ff5360e0a8e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the presence of external URIs and the 'link farm' heuristics point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://synerhu.ru/uplcv?utm_term=how+to+check+if+phone+has+nfc PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb6440406---jusozobejutuvo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02b6ce126---pesotavobuzusuwenim.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/52197336765.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/xajojitiredajomalol.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/vozuvov.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/54150821167.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/xuposagokigubudajo.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/6193342716.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/milexevaxodanazotu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f496878a34---dowulaganugif.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/87222909829.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/15547081240.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5fdb2307---31954939208.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/korigonegasifudu.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/kizop.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/85858142278.pdfIn PDF document text
    • https://bawauang.com/contents/files/gobudosadulitekasironir.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdfIn PDF document text
    • http://carbontuning.ru/file/zezunerejidunut.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/25661511876.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/panagusonusopala.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130741d9064f---wujarebamirutoranevibewak.pdfIn PDF document text
    • https://heureka-cz.eu/files/76376014521.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/97652570557.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fakimibabosomatixalabeb.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/21561890716.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_off0000bb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1E 16220 bytes
SHA-256: 95d19b006b16602ade09ea90c5d91ac926c271fd69e04ddb4c4a79874ad6803a
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 10600 bytes
SHA-256: 13cab6a84370453d179133ccaf63f5f5912729f0d9e32612f439949df7a31f7c

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