Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cb82766a289e7f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 12:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cdfe3e0119d0c21939cbfbdabadc6967 SHA-1: 509ecefae1a8f5d81dde27dc8cb93617d519f3fa SHA-256: a1cb82766a289e7f2319ec3d2a3669b6e23380961660bb2d254d4b0d047e5f2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

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://philabc.ru/uplcv?utm_term=notepad%2B%2B+for+android+phone PDF link annotation
    • http://interroadholland.nl/userfiles/file/binobarevifonuwoges.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/notenorimikefege.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/vulisutipuxovitafe.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/87366681946.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/emeqqun1saa6j14roc3ggpmvcn/76831553673.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/91737606933.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210906213514.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f3c8cb3---12097146196.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/naruzugudaj.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7b1a7e9ae491c777fda79681efa80388/jakifuniguxazadejugefa.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/riwidij.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/24125694958.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/wopajezawamipilorus.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/98072560879.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28819186555.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414459bda5d---57110805356.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/xusobizotujofixan.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/71282646185.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/luselenetosoxuno.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/49385601696.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/pofiwi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/37315520417.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/jegat.pdfIn PDF document text
    • https://blv.by/upload/editor/files/fixonuxijujunajovidune.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/28071243302.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/lojiwifugatugasupogopimap.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/36586404655.pdfIn 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_off0000b928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 10360 bytes
SHA-256: f6fc429fbe79df8f30b6147693e0440030c41913c553ea57319e8ed40ce5ddf6
font_02_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 15172 bytes
SHA-256: ce6460e52b1c7543a2dfbefd3a89f7954e531a4fae515d6b3be19f4354bdf5fd