Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf498cd65b40f99e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 02:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 146b987a18763047dd5de80c194ea645 SHA-1: e3b0acdf80ffb335cf48dd1bfff70beb61349370 SHA-256: cf498cd65b40f99e2c567cc190e64d00e3e4c65147c9f5b13cfb2394e7c13c16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/20805165024.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612171a936e65---97629740004.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/bonabubozapokejiped.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/2041617069.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/suvaretab.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e1cfb9991---fenajederifidoti.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/15973244994.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/nekazonejujidujekemered.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/bagiguvivogukapul.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/96932232802.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/37801123727.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8143ee604389b06db8200a0f68724594/vufewopozod.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/kivonoxeb.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9qehmn6pv9o99kdtvteln7f8c5/85122651797.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tubirolubezazesu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075b58e3cbf9---farezun.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3cc75e1eb---35218849082.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/12318f77dfc103a7cb7dd30ec070e24f/92547326087.pdfIn PDF document text
    • https://bliznacite.com/files/lorufibufosu.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/66359060602.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/13453039918.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/22528943910.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pixisivojowigora.pdfIn PDF document text
    • http://benrassam.com/uploads/files/jurigu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///30815553033.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cc52174eb---13856506546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=30+day+exercise+plan+to+lose+weight+pdfPDF 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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 18196 bytes
SHA-256: fbbaaba6cdd172952c3bc3fe257366e5ab76e9c9d6736b196b55beb66e5b35ea
font_01_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 11400 bytes
SHA-256: 61524f1a2c9fae73f9176c4e639aaae33ac2804cfc9811366355a7ce867c1bc6
font_02_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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