Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b040658dd4940a…

MALICIOUS

PDF

81.7 KB Created: 2021-08-22 18:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ad4f59c18819961ace4789cc6093a09f SHA-1: 2093628d4c6cad343c75b2f33212698a59cf0de1 SHA-256: e9b040658dd4940a644a1b8b37287ee52c81dcd1daeab005de558edeb1475ba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous websites, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jkphotocon.org/data/userfiles/files/86787021806.pdf In PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/98813412995.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/zazasotudino.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6d178aa78b8a7cba1f58b479a1c14b2/volividoguza.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/retiloga.pdfIn PDF document text
    • http://babamoleskine.com/files/file/velekunubofewuterafuve.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9d10e9b9ad9a8bbf04da072788498be0/lobafifugusut.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d6e6f5f7---69321119664.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f0c59d15---zemifaxijatinalidabadi.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/74630335871.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f427834cfe06a0f7646b2cff6f4fcc55/94357727956.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/kaxelemokevanoxawakuloj.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/mojigitenixob.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/70941706986.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/48840958837.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947294f24d1---80959735112.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da0390de465---wevikokatofezilapedab.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/84982335849.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5307ff20b5faf74f7a272cf096d9d5f1/tibabafedawabuzobejedif.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/sesodituxabanabudapekirir.pdfIn PDF document text
    • http://charivne.info/images/file/64828376063.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19d423d1a2---fudasipixunoraxukubimi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-22/20210722225050730363.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/67108097717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jlg+boom+lift+owners+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 18392 bytes
SHA-256: 5679f5dc3b635964685302b990450bcc0b81d4f5277e1244c3ec478a3a74e197
font_01_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10876 bytes
SHA-256: 9823d16404e72cccead14b5aa44f2f906b3a797a3d2c0ab8ce1dccda4b34c290
font_03_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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