Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab14429f3de161b…

MALICIOUS

PDF

82.4 KB Created: 2021-07-07 18:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3314cabf19fcc46bc7096d83116a9dfb SHA-1: 1966f6258184b8f3dfb331a28b61d57e79c12a9d SHA-256: 7ab14429f3de161bb08f080c58db983349a90bfdc40a0438c424abb558662acd
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://irlanc.ru/uplcv?utm_term=use+was+or+were+in+the+blanks
    • http://naturalmis.com/userfiles/file/39001942422.pdf
    • https://olterus.info/contents//files/kixamez.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f595356670d3349c9d463b1728ea38c6/99730047409.pdf
    • http://rjt1.org/upload/files/jogunexukadirizuzututiwi.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7980a6fd---15311543610.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hc4sm8ng7a76rbdr23sq911o1k/33195185016.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/snupo4pcqv1l9msmbfgm7dsoi5/46537593833.pdf
    • https://247hvac.ca/fabulous1/uploads/files/togupizezonisutezop.pdf
    • https://bodegoncriollo.com/userfiles/file/xixogusiwu.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/446651adeecafb11ccd4992ff0da6d0c/14946732988.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bece759fd---nodorunulawatozijozar.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9e484k4h92n3theb3jeuc1b9at/bedezadofururofekimati.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a561479f342---jazajura.pdf
    • https://healthmatters.me/userfiles/file/fajeso.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/6j6eleppgm2i1s6sj4r4o9rtlb/kumajarepazavedaxiliwer.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/1v9smp2c6tch70874vll2t1gn1/notixofesizavoj.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5e9efcc5e6ecd1d39568964a73610b31/76779998568.pdf
    • http://alexandraharris.com/clients/36054/File/reredaxok.pdf
    • http://boilerservis.ru/uploads/files/zujupuxavapil.pdf
    • http://naszymsladem.pl/upload/file/nulowilipe.pdf
    • http://kingtonkatsu.com/uploads/files/39994509545.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 16792 bytes
font_01_sfnt_off0000ef04.bin
4e4d3029b611157a6948284d374bc84c41336e8f4481535fd34269c78cecb789
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10532 bytes
font_02_sfnt_off000106ef.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 1636 bytes
font_03_sfnt_off00010ebc.bin
5e60038d10d682091756def03e137b45f83a9e4fa3dcb04e513d872cf46ff209
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 17104 bytes