Malicious PDF — malware analysis report

Static analysis result for SHA-256 7366d08c2fe7c26b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 02:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b756cee7f60c4f94c5425a872f6ff4a SHA-1: 4bf19a5b6c02f74ceabea62ee14ce417e5175375 SHA-256: 7366d08c2fe7c26b883e9825aa6fdeaf47fed8c5f9bd4016c51167e7cedaaa90
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, many of which point to compromised CMS upload storage or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beming.com/ressource/site-image/files/74156300629.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/07cbb20d208e711cdcf03081d76841ff/ruzasaw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320d44a0666---tupofi.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/rifarur.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/putiwonor.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/21420140493.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/41471771960.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/62608828038.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/29782183215.pdfIn PDF document text
    • http://kenhquangcao.vn/uploads/files/wikegatavaw.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8a8d166262852c3f1c3d7d412e473359/55739363815.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/pufizokutedozig.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zefovupamaranezuforus.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/rozosowomobutap.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/3101612814.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3fa45020a9daf1877c4ad6b053d00f17/bavitevafoboj.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210923_030307.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pukajubifinebakewamuje.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/50324118749.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/72810397239.pdfIn PDF document text
    • https://mcrlclient.gilcom.ro/ckfinder/userfiles/files/90688463173.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/natavekub.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/83f76639d385e47c60c3c6cbfb0cc0e9/45370898481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cool+things+to+do+with+a+command+block+in+minecraftPDF 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_off0000b046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16444 bytes
SHA-256: 8aa925938f584c8e0407f37f2fe02fd1111a8aebf2f5d538f97b158f2c44604c
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 11272 bytes
SHA-256: d4e1f1ea117cda5cdf2db68ebc7fd96277076e0a92bc4c1169a282627da93b3e
font_02_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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