Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4cb60ffcad9303…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 02:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0adede1800c2380622cba36b5c7e5269 SHA-1: c971105da3b6a9a4112adad48bbf620566074eb5 SHA-256: fa4cb60ffcad9303751ce27872e4677dbace77aac0ea499ae3f0487b445c0488
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=blumhouse+truth+or+dare+full+movie+with+english+subtitles PDF link annotation
    • http://ipceurope.com/assets/file/38935326786.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xinerowewogivunam.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/65dab25ef48e8fa1e4aeff33308b1d33/wavesezowivoriwen.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e0c0eaa27f5c5bf94f08f285333a913/7190386544.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c551747ad4f2bbc4bdc6e0709c5c71b4/18317523340.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sexatezowiwuvam.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/zinuvijajugumux.pdfIn PDF document text
    • http://nfc.soo.jp/file/dikar.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/fajogumafofinufimakibax.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007a9cccd78---fotipi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be2de5fdd---32168941863.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3e84adebd9bd64f7f571860ac18f65ce/jawawapejiligorobali.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/galikuz.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/59975718252.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuxiriwisefu.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/42913161984.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/1016739941.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/mekovozalaw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cf914e7140d---99648049377.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/sixupogabulenokedak.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/99744456046.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 17180 bytes
SHA-256: 9b736e46b798a4f7968b8cd4e75fa319865749a4438420ef8a9205423bee6d5c
font_02_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 11244 bytes
SHA-256: 149999b5df7a60859c1e7c6f6842f63b48392fccfa8ee989d281d2c9f4509a81

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