Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63b218f966d8a69…

MALICIOUS

PDF

85.7 KB Created: 2021-08-17 16:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25b21a7a7d8dbaea2a89b7ced0e3793d SHA-1: b7279d69c562dd1af447570e032ac75faa2f25ca SHA-256: c63b218f966d8a6936c5e6f8e0b6956bd702eb5312d530d72966a883475ed71a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These URLs likely serve as redirects to phishing sites or malware downloaders, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://moto-trend.cz/public/files/fck/file/33542371849.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e3aad03b4---wokigilokuzedifutevime.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sdbfiepqoqj101cai0psuttr27/83345471753.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dedow.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/75931637929.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/66884673492.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/31105400010.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/rawadep.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/jenenijiwudutugarekimaj.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/48507839111.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/341196575.pdfIn PDF document text
    • http://jarosi.hu/files/file/19760851398.pdfIn PDF document text
    • https://dptech.vn/uploads/files/42044048968.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4e5196da3a4e2a6050d4397ba6cb82e3/gevotegubeza.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d0dd59e7---betaxezenotanufilogewit.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/21318773939.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfba3c5ef9---11165321079.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/88614152980.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/62065853884.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b611d080948---tiwipemefafax.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/99d7430eedf97cf83fabc7ef43f037eb/govil.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24af34c23---74687077245.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281253537218.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b73d5fb1e---30198394509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=como+fazer+o+periodo+vir+mais+cedoPDF 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_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10692 bytes
SHA-256: 1d869007762db3facada2fd14ce89f91254f6c125b43ba1b22d4098d4e3a5a3a
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 18568 bytes
SHA-256: fa8c0cd887c9be6ae57844ef2d0352f0fe6dc5d011edf1b41b4458dc7b516aae
font_02_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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