Malicious PDF — malware analysis report

Static analysis result for SHA-256 af00f118b7e520c4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 11:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 153f6d1f02b55a2f6061aee4bbe064a8 SHA-1: c50d12278c2ca63bc869a337f18a0a4d795f776c SHA-256: af00f118b7e520c46b692debb14cc0f653d610310965f18cacd8caf84bbe20eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bdsps.org/slbdavbatala/userfiles/file/60049004420.pdf In PDF document text
    • http://planetamama.ru/files/file/10230705467.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/292c95856d6969bf954012a1690ae2cd/74806965435.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/10696501629.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/42670669792.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/92017478784.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e57d45cd---70108271452.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/84850285399.pdfIn PDF document text
    • http://gibeaufamily.com/clients/870383/File/8386438399.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3khr3vk54jih3imlat66bls2q3/94851745834.pdfIn PDF document text
    • http://kme-kme.cz/files/file/kowedigawi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02de1276130b6f87d9b4da3a128b33b4/33654998325.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/6ebae968e5e34c66aed62155b3ad5f5f.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/99326440213.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/11720503062.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jojabubixiwipirasi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/metonojojaxakexesa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uf1l2qkdnch2fvn0fup2glthie/79899867697.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba309c4c69c---jamogop.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kds544fjgite2b6pmvt1h27545/4372417667.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/lolivapogupefofowabozet.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/03s9thlfus60hjjiu6n8f6rjha/78870559338.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ofmb3frluqgdomd7166udetm38/68978592811.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/wowuregatebakem.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8e323824---dujewabekaxosete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+hacer+manualidades+con+papel+chinaPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6739471f602cca8b11eaa82d126b9abf/88388768619.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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 18872 bytes
SHA-256: 2934594ac038f54640aaae9236b655fdf45808bbdca631ec53166c937162599e
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10812 bytes
SHA-256: 9e7091d934d8877cdcd403fccf6d61e3287e2e8b1b24351799e86897d9f7d2f4
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1