Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01b3957a0bff75d…

MALICIOUS

PDF

79.9 KB Created: 2021-06-27 22:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1ac39a2e86c717033f2ca392a34f1b1 SHA-1: 8fdfa317474f86bf69234a6e1a93d3dbd739b260 SHA-256: e01b3957a0bff75dd2547db523b90a42c2b0f97932ad5ee9031a7fb0aed16ff6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1t5s27k53t22t9aur6gh9cbapf/65313080371.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc2c0a760d---gudisuf.pdf
    • http://allamericannursing.com/userfiles/file/57921678260.pdf
    • http://asesorgubernamental.com/images/file/posasikikamep.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/agfc748ueta6qj3imqdr15u9jm/zepigemoxe.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/41f83f01104e890feb7b1c0a0dc5798b/27680564744.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/6bba0929ba1873e4bbfac16b73744ae4/melavigedejulifufa.pdf
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/kaporuwijafuzadobus.pdf
    • https://eobliecky.sk/userfiles/file/guzodaxemeralar.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fc6a941087a208655917ea4a25ac4821/zadodejowebop.pdf
    • https://people11people.gr/uploads/File/31657437191.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dc83a83b8101d9681e2f11d26f4cad2f/gopakewutegogusatuti.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e7d96768---nazuvepitizebupugekadaziw.pdf
    • http://silverleafspa.ca/clients/10619/File/85349510175.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/79cfe1a4d7bb2677f797375eda42bab7/lejofagipudavejaxopatadu.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/gt9rcba0e4nhg7neli0basbvd2/zetolujorisaj.pdf
    • http://ziconiavip.com/uploadfck/file/wowezigopipepaxeka.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b385bab80---7478924438.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/96647504129.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa002d212e---92101127517.pdf
    • http://langeline.com/ckeditor/upload/files/bodevobe.pdf
    • https://powermailer.in/userfiles/file/30745705643.pdf
    • https://champion-osk.pl/userfiles/file/dedudanebidutasowesibadu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2h7h8eq1a20k8ndu8bs1r3oegi/71552074311.pdf
    • http://grupposcorcia.it/userfiles/files/61567957482.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085fba5a5486---22788852892.pdf
    • http://veraschwemmle.de/fckdata/file/15013159597.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ed+sheeran+it%27s+just+another+night
    • 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_off0000d630.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 16792 bytes
font_01_sfnt_off0000ee42.bin
cf8df6708416fe4a86fe2fc48900d756ca11cfbf895900519eaa632a2b34f974
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16736 bytes
font_02_sfnt_off000119bd.bin
008c2eed10cc2b74e50afd66ee072acbd7f076b4dcf617542fdd825596b9bc0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 10728 bytes