Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ca843ee1c74d8c…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 06:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 971fb0ad1b485e45c9ae22e8f07d4893 SHA-1: fe67e5c1bfec2e8504433e7d79adea656e6e6d14 SHA-256: d4ca843ee1c74d8c06093e4f407953676380f828393e508bcac979998909f54c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://inwebjor.ru/uplcv?utm_term=golang+int+types PDF link annotation
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/l859u2avee40oac557l2pd8n8r/bukesor.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/01b44255c3cc049f270db72753c60313/kavagalarota.pdfIn PDF document text
    • http://markone-tools.com/upload/files/90714876086.pdfIn PDF document text
    • https://vaynow.com/wp-content/plugins/super-forms/uploads/php/files/58de47c39020c2e87a691c9b5f70d3ba/40216888585.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/newipazalajadop.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/6342969630.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aec7299d1---wejoxezugogatok.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d4dc7358---baxotunan.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210610_97A7435C8DDEA276.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rezozejuxodewaxagidedako.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/vojaxaxojarolirumetubizes.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3a52f33314addc2af022ad6d4d9f8651/lagabalukopobiladinela.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dfbf6bf97---jinedabubu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce74abaa36---kagizazatubibogedorut.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/31917718583.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/c06g77efqovf5nnute2rd4p3es/nimajubib.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/tonuvi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/65461789187.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d0bdd862532fafcc584f2cbf8f383115/karebezepikagofijite.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3835faf4ae---vometabewareguxodinid.pdfIn PDF document text
    • http://lucann.com/Upload/file/84767086900.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf17f0f328---rolujowuwi.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/vovugoroxira.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/24888165231.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a9d793d8---galifupelefexoxumidowo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e5d28bf651bc097ab22a533975135c5c/demoz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 17468 bytes
SHA-256: 893e86c1509f61c5a260d9cce31ffa0bdcc29236788034218c8c32855a913846
font_02_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFE 10480 bytes
SHA-256: 11f779881f2316958e044e057c5e5498133f576bbac0ae8c5b55ceaabe4266e6

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