Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c13ca3139496ad7…

MALICIOUS

PDF

96.3 KB Created: 2021-08-12 08:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 093094b427b50191739a39492abbb3a8 SHA-1: c337f5fd26f439892728bab948c982849a81a81d SHA-256: 0c13ca3139496ad702c1ac889ea0748d938199aabf548da36a3cb97c4f1d472e
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' shows links pointing to compromised WordPress upload storage. These findings suggest the document's primary purpose is to redirect users to external sites, potentially for SEO manipulation or to serve as a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://avigailpekelman.com/sites/default/files/file/roxav.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7ei6f3n9dd0upugi9fupldgg04/kubareloboxuximidosukafu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/79872359161.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/i30rn0oaipds8o22d8gge4bkcn/95082691063.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/42292275820.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/81318604817.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160756c9091e8b---fisabatoxopagakewujotu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/suxagitofipepim.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/pabawokunegutogas.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/11594467659.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093389b867c8---31912524149.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de7a4781d---27556171008.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/b01mf4kl57a1njspjhh5tvo6jn/57803321667.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19578211374.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/sogufuxufaxomusonab.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/40809272702.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc68f6dcb73---xogejugabigixugupoxinal.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/sijeve.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080371d9e39c---toduredinuzuxafanizinomu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7fbebea7dc9d0d7524c1b864aa4f52e9/jojaborulu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9230817149.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/21197337252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+learn+french+pronunciationPDF 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_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 18560 bytes
SHA-256: 54d2b6fb9caad63cd7f765a76c0003619666dafc96e167fd321e80aaddc69b10
font_01_sfnt_off00014178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001598f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598F 10584 bytes
SHA-256: 4c042d1ec2267af5c6ad9d7e49284f21b6cf4bfa76059755a4c2051a9c75d0f9

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