Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62cc8f6e700346d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 19:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d5477840610070acf8f8d88b2f8dcea SHA-1: a350f72401ce646dd1e1afc5980fe7d38e05d586 SHA-256: b62cc8f6e700346db935502d7d8d8797bdb350a0b72b9637716bf52abf61aad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, hosting numerous URLs on compromised websites, likely to trick users into downloading further malicious content under the guise of account recovery. The presence of external URIs and link farms on compromised CMS uploads points to a sophisticated distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nevisnews.com/userfiles/gepofabanifetapov.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc9b31a1f---vonumumaw.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/81953154591.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/wafisasokawukis.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/917b124547ac1863f066c42870f328ac/41436795055.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/zesaliv.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/86242285246.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161421f7218a3c---xepaxiwalu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/dajebawadufalowikit.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/70877425297.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/25648685656.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/wojorimaza.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/79789580667.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/penigofimaka.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/suzane.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/gevatuva.pdfIn PDF document text
    • http://palami.by/images/file/48779901290.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137867d7cd85---sukefagezifumabiw.pdfIn PDF document text
    • http://poliinc.com/upload/files/18572525608.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/kawuloxukeladaxijiwoza.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/51955090417.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/14147779853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+recover+old+fortnite+accountPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/wigagotutipumivejatopug.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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 10544 bytes
SHA-256: b2eb2795120289a4b2b4ecbde5dd95a4f59e6b4c6c491c0829a880fa828a769a
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 17544 bytes
SHA-256: cbb591683d2b2c637c784ad29536989ec229447d4eed81cfb192754466ec471f
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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