Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5694165da464be3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 18:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: faf704f8c9f71ce0d4bdcf72d784327b SHA-1: 4cdf300e1fe2ce439ec0245022c827c13d5c091c SHA-256: d5694165da464be38a54b911764579fbb7c6814a00d7adc62ecdf88a35188645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other malicious PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

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://medvor.ru/uplcv?utm_term=chemistry+class+11+ncert+solutions+chapter+1+pdf PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/25dab7c7edd1cc3b211059beca3c2482/niwegituxadof.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/kobutuwididuxaxafetova.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/47016991936.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///lorumoritofafakuragifobus.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd430d4cf93---94417587924.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/55650167163.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/627680851.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077937bee423---16610481730.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/pagobusidorufudatafa.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/12378045733.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f3d3e407e---31815134054.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/babitumaxegekuzibob.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/42f3e1f4e331daecb8e7dee9f21d500d/59286222551.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/11993469572.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f734598b8---nufozekupanapebodesezib.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5e0e306d2ca611009d3aad2879cec2b5/9111516740.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/93414266382.pdfIn PDF document text
    • https://soechi.id/userfiles/file/82912951392.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107bd0a34268---59990842852.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/xewitisitevu.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/zejipisi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/lajudibap.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 11180 bytes
SHA-256: b21b26323aff74c32a96298a1a2f257ae4fa9dbd0ef4ba417bd3adc72c6c82a4
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 18628 bytes
SHA-256: ee11c46913b8b7dbc957683ed6613ddaaa867b386a602805c31fa99ce9b77e48

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