Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0e84fae5d52574…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 07:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c91e8c1e91084eb24f29b9479b5cecad SHA-1: e5ac5a8f01433644d1e221869fc441573408994e SHA-256: 0d0e84fae5d52574e86a4232c000edb090be43bc3619471cebe195031d263d04
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for distributing malware or conducting phishing campaigns. The presence of numerous links to potentially compromised CMS upload directories further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://conditum.nl/userfiles/file/92021198623.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139684681f48---45945886202.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/xezumivavufur.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/wowuviki.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d370f01e11---tikolefajivufiwopinewagu.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/46301241402.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/mojebesojatomurudosas.pdfIn PDF document text
    • http://bresky.cz/res/file/43844537078.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/5861670599.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/jumesunibidudetafejirev.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dakagodoxitixatomisufox.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/66779339282.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/52531662103.pdfIn PDF document text
    • https://la-klamm.org/Files/files/nasilaxomamuga.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/23531632311.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/pigolol.pdfIn PDF document text
    • http://texmet.pl/userimages/file/mibarulubulul.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/82813036294.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/daposidetunujem.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210901_D0D1B056E0718A14.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/kewokesoziwe.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/durifujirurutipazur.pdfIn PDF document text
    • http://www.polni.si/Images/files/97641368311.pdfIn PDF document text
    • https://gencatakan.com/upload/file/todafeb.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rupalunuwunopepel.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/wuzubusirazumew.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/78545545387.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f283b168d23e1bb1a9e5370739106b32/ziwipimoxizodonivipifaved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+online+iosPDF 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_off0000b75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16196 bytes
SHA-256: 12cafc477016f77de0a5cadcd919c8afe5b3e6e4d6685dbe02b9d27dc4da5d92
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10176 bytes
SHA-256: 2de95e95c98de14f0cff59b44a37879de7b8a3fbaababc2c693fcc790a8eb1b3

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