Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaf2feb6c2dd4a8…

MALICIOUS

PDF

86.0 KB Created: 2021-08-20 02:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f393cf461b0698e1b5d0c9aed50f89e8 SHA-1: 659cc77ecb44623c9217ccd06e889bb0a8777389 SHA-256: 7aaf2feb6c2dd4a8486ab0d198260f823d74e2a64603c2a21e75b58a10481985
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://ktmcollege.org/public_html/userfiles/file/41404686819.pdf In PDF document text
    • https://beruanglucu.com/contents//files/7732847816.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/94206198989.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ih35nane0hj8vjd5a4f8240do7/zidotaredudovuzefobi.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/nedunuvitebef.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a0d15499d45f6639f98dcabafde54b51/finusosilafifukurobavig.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/uja4u1ceki4r2jjpi9blcgtpn8/77360504520.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2be634e7---mononupamo.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zaleguxetozekutalabevune.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610007b163318---zakilum.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16103e5b77c6ba---dapozozigotenobowi.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/bozebemiwazoduw.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/41065879407.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/5334342008.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/d8d4233501996b65d6f31e33229fc0ef/fulavegul.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/0d4a4328cf033d46e8f71853fa76a9bf/kaxezaxerusadexapo.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/54248150030.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/85888218690.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088716f61838---timubutezan.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/17035106575.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/favaziba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+reset+a+whirlpool+6th+sense+washing+machinePDF 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_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 11064 bytes
SHA-256: 09e2c11eb1d59d26611f60847a10bab87492af65a0813ccc11a6adee923c604d
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 17544 bytes
SHA-256: 5e1b81b47ff3d870beebbacdfb9dd28cb001859b3e8f3071033ac7c4ecc20271
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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