Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c86f1546ffa45f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 13:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3cd3b44eab588400b09cea6691c7ee0f SHA-1: 4ee5c0b574d58d6a75578c30130012d5d44de294 SHA-256: f9c86f1546ffa45ff93a93c3da7c0013cf1c2fc50e80821f45f1e066417f109d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to other PDFs hosted on potentially compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://njxinbell.com/upload/files/moledifadijalotikopese.pdf In PDF document text
    • http://varadimasszazs.hu/uploads/files/sexerawowejafusalu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131633dc7e05---82901471222.pdfIn PDF document text
    • https://duvanco.be/docs/files/18710902916.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/94171742730.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210908203838.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xafevupewazufu.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/59643994296.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/vavudaluva.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/18958706155.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/38928786433.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd25d03618---29815320002.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373710e71af---47302789466.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/40592277198.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/62489815902.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/25131480262.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/97864097934.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/582187cd9eb982593ef8472c1fbda35e/rilukedapuzikikowabogan.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/61386036674.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130a7ec19c---75808084049.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kukajuravufawogutawofav.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/19402295370.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/9508770440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bloons+td6+mod+apkPDF 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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 10544 bytes
SHA-256: 1c4d787637a7850e88cb4700f761e0e2dc2fbc1a72ac40e7c6b1870b406585de
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 17388 bytes
SHA-256: 946a2840232181d75d6addeb6a5b5485980c9fa8b4117325e497595692f5d9c3

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