Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c50957cd9d75ac…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 06:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 597706c47b155f22cd181f6ab92f6596 SHA-1: 56b4e1aecfe537ef86e7d634c30fdc8771d72974 SHA-256: b2c50957cd9d75acc850d2b6e21685ef47100b22aa499c760b5fc3357d5af73b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://hiniceshine.com/upload/volaginonazalafaxogomisi.pdf In PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/88724399457.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9i1jf42vud2g5e19nnc938t6v3/25016360093.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/letanifewatagowusejiza.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/dufok.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/bokibubazorozakuzumova.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/67191606078.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/rekipavuwo.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/63176052467.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/11701108552.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/72732678250.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5a15d2c1341f67fbd24d03ac4d2e3d42/mapajelu.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/minomaporapajuk.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/levomidusomosibimara.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/10101643530.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/rusinesupuwepewigijapow.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/xopojol.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135430bb27c0---mudirereju.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/nexizamulege.pdfIn PDF document text
    • https://cian.hr/userfiles/file/tetulen.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s0i6fo9vo3im074bfukpt8ocr6/fovisopo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/77604507531.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/lemudibumasofe.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/92313680244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+run+tracker+appPDF link annotation
    • 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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 16712 bytes
SHA-256: 0cbfa5a4b6f60ac9b11a1c983c07304527909f1a4ad9e72cab9826d037120a55
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 10464 bytes
SHA-256: c7ba724b07824f887895fcfa57a90fe277ad7787f90443667fb81ec24ca60e4b
font_02_sfnt_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1