Malicious PDF — malware analysis report

Static analysis result for SHA-256 690a709f63fcad2f…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 20:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c49fb6751c51c2a7521a20a8e8e9557 SHA-1: 76fcce71cc8748a331e7e7f16218783d464927b9 SHA-256: 690a709f63fcad2f2c4ec7088783c00e9ad43e283443fa2290d14ec76252fb98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qtjh6h3idr6qvfdbulrl89v3c3/75864564546.pdf
    • https://denizlihorozu.com/resimler/files/73666099144.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0470d5b70f886735688f3df1b65124df/sibupugurowes.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cs0aofeco18ff3muaulrvh94u0/lilafinaradajakepokun.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tak4isgk681em2gkule1hreqo3/tumixipisakamimekagibe.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/vojulisijuxagaz.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2qhqc9ngv9skvpdrsgmih7floe/xanipavufugir.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6056832a---15954097081.pdf
    • http://logistra.fr/ressource/site-image/files/65848787250.pdf
    • https://camgloberealtor.com/userfiles/file/nujizu.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077528ebb814---ginimuwananalapozuvilug.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b7f260640---maboji.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6mp2bvvigleim0b39kbdqvt61g/87092292646.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6093e873ef8205515fb0452a34ba103e/31940114632.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3d0a314d---dokuravaxav.pdf
    • http://purofirstli.com/userfiles/files/gafemesesulelimeduk.pdf
    • https://oklogistic.lv/upload/file/17410757816.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d871b725c---zalebinitiwutos.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7682d2cd---13087660423.pdf
    • http://juha.be/_files/file/poruganemafikofipa.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d799291d3---51754618965.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+my+imessage+account
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/de452a8da2d6ef9250235f4d1fd32dd1/15525954460.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e600.bin
0485964019c8763131e340ac90ab348e5a1b5dc750a1e384d705b27655063084
pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 18784 bytes
font_01_sfnt_off000115bf.bin
ecca8c327216f44d2382e0efd389da7babe0aa6c1a4d756dd663aea6b64c16e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 10740 bytes
font_02_sfnt_off00012e5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 16792 bytes