Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dff45963300b77…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 02:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a40070816060bd271e721aa7f26be47 SHA-1: 6d2b9e542dab2ad8abf00f87033a445906817e50 SHA-256: 35dff45963300b77fc123a325321c53611850681664fce195610b4a27c3fbc06
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of multiple external URIs and a link farm structure points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50647385702.pdf In PDF document text
    • https://visualarchive.bg/files/safatubuzofiveraxabak.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/pawatevutumorekelol.pdfIn PDF document text
    • http://hijoin.hu/editor_up/30310016562.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/jogisijazewutoxiwazutaw.pdfIn PDF document text
    • https://tigaintan.com/contents/files/fujigakuvejuzuwa.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/82186308197.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/2529986798.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/27470620603.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/nemanokesifuwenabu.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/17873459872.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab15d0c400---85003785211.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/92480591526.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/regeweratiximarosupevige.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/60597275535.pdfIn PDF document text
    • http://bastola.org/userfiles/file/bumodezoforazebi.pdfIn PDF document text
    • https://oferta.lt/i/File/76898572331.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac99f18cd1---somaxa.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/nidonilafujagopez.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/rawikikesuruberu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zanojufazata.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_003050.pdfIn PDF document text
    • http://saimiri.name/upload/file/793226156.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408643b8ba8---36117304844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=auto+chicken+esp+hack+apk+downloadPDF 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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 22096 bytes
SHA-256: 5c02dad9e1e347b0cd5810d848639ab9aaea5b75f49eb781417cc05ef0398a4e
font_02_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 10772 bytes
SHA-256: ecd63c3e0ba507a2de4254b46ffa6b8c8f2c9832494b15228851881b5b62d4cf

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