Malicious PDF — malware analysis report

Static analysis result for SHA-256 44640b52982db3e0…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 23:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8608be8a63000d7ce94e0e5500c076a SHA-1: 665bfd6de70bd26855b8afa471a652082eda0efe SHA-256: 44640b52982db3e07d29be38585cec8ca947f559c6dc88ec5ff85fc0311caf31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=international+trade+and+investment+law+pdf PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a43dc491a4a---33291511995.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/wiwod.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f623dddf6561b89f30e5688f41265a4f/59013978480.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mf8pu5gqcfomg1kppq2t1e4ua3/wokerozikes.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/33321349566.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d86f1f339---17875015539.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/23830434441.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109022315427562.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/75588363978.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1ci8r6ibnf2n36oufsn17nm9sp/25520215779.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8225dd08a6---95307107116.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wikokafuzowibibejutemu.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/nawimogusugim.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c34844a725c---1625471325.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988f8d1ff8b---rulan.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210810193622.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/54836581797.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/dodupametipetes.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/gubiligefexulinajawusa.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/63482973875.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/lmsdnr2kekeupvk8aumtf0h7sq/memivowob.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e0e7241de4b45ab47fe6086b28e5754b/kalunifubitijonigel.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/juzivatarojakux.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_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 16688 bytes
SHA-256: 1e8157c3d96855111b6e70d9e6300cd3469d4fdaeb637d5a391b6aa32c455a9a
font_02_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 10764 bytes
SHA-256: 0d7aec984582f7e4867e1571185ebbaab185d5ae2651222d6ee57db3360a1a41

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