Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f6855509e2b82d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 00:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93be931df88e8508e1df3ae5dd006eeb SHA-1: 22b41ce281fefb5597efda8bcea6818be33ef7c8 SHA-256: f0f6855509e2b82d13266525378ba098dad588c15c8a24d444c81701e39e6f8c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://ofly.om-digitalsolutions.cn/upload/files/31804264421.pdf In PDF document text
    • http://contrast.no/ckfinder/userfiles/files/8003672425.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147a7588bb2c---21068589758.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134abe0501fb---36377336279.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/96937655780.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613a274830866---napuvi.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/36879339484.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/zulikatidubizopubagupame.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cd66cffc---sudafini.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/85124644349.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/leboruxifo.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://freestyler.cz/img/file/2881371506.pdfIn PDF document text
    • https://ccskin.com/geektic/files/purixobagenawobib.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/14818102683.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/59542242192.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/82441953526.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/zuwunisub.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/delife.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/71712044446.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xesudubusagowor.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614030a792366---fiwofaseliloxibuvarow.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93483707502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=principles+of+instrumental+analysis+5th+edition+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 11320 bytes
SHA-256: 1b0c9768da113cc5152148f73634e7939ff5dbb142e244ae742800a645b85c59
font_03_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 19136 bytes
SHA-256: 25b74c24ed6f9689b6ec48d98abdbb486ff760dc6796c326e53bdbc496982d52

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