Malicious PDF — malware analysis report

Static analysis result for SHA-256 413a1a58bbea452d…

MALICIOUS

PDF

76.6 KB Created: 2021-10-12 06:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db397251c15e1c91099022537a2ed575 SHA-1: 944ff0d8cf6b4ba934af80df8500400606657024 SHA-256: 413a1a58bbea452df64467a82b2fd4db0f00b77472bb2ee0e346c6a61d3f408f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://irlanc.ru/uplcv?utm_term=four+letter+words+ending+in+o PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca71699c81---30716015106.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d76ff70949---66061369788.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/vemejeruximipejunepuper.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16161add6d09ff---padovotoriragonofoxagekap.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/73547676652.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/765fd7971e8fa43ddca68f13db88ff87/14559067669.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/lozuxudo.pdfIn PDF document text
    • http://jonme.net/ckupload/files/wunamosotoz.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/31947381345.pdfIn PDF document text
    • http://rld-carbon.com/file/60909259223.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/egitiwojanazelix.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/21371153674.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/mevobulegasorulagovimizof.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140524d402fd---sozapatu.pdfIn PDF document text
    • http://hotechike.com/files/files/faxamojuzuputuwafazama.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/lewiboguzufu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/lemud.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c34a93c9d345354c3e23a7235dcf72ad/61649275950.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/rowakobapalunixuzudaxabo.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_49F45C21720EAA14.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/62416975283.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/39525280209.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/jevomimifiwepuweminojat.pdfIn PDF document text
    • http://balalajka.nu/media/juxomo.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/11695520525.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/82877733983.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/88008644717.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_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 10424 bytes
SHA-256: 4c2554b652092e410083730878c39cd7805e8049cfeba4325aca751813dada24
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 18364 bytes
SHA-256: 069faf175fe39c169013062294bbc2fb8a7066c73a7ad0921c0cf7cb4c8821f9
font_02_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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