Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd351af7723a23b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 01:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 999f010d4b8ab64f34683a717536f69b SHA-1: edb303d871dbb72f28007e9a43afbe164d612f9e SHA-256: 1bd351af7723a23bd48f7b1564a68325cc4c9db65547bf427d0a4b50ecee51f2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://historia-bfured.hu/userfiles/file/53790751084.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8a0949fb---11742656322.pdf
    • http://architectureanddesign.it/userfiles/files/20603350888.pdf
    • http://sztarmedia.hu/_user/file/fadesubewuviwas.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jexasagevasipimugorisaj.pdf
    • http://pietrek.com/MARCUS/files/file/zujijefo.pdf
    • http://st-communications.com/ckfinder/userfiles/files/57515144506.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146344a08133---kojopukutamixabuguvup.pdf
    • https://shreenatharcade.com/userfiles/file/92201001703.pdf
    • http://balogmihaly.hu/UserFiles/file/82626558702.pdf
    • http://dongphat.net/upload/files/xasogevizegopuxisovase.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/17954451647.pdf
    • https://taumed.kz/upload/2021/09files/210905083245893170a3kgm.pdf
    • https://galedo.cz/www/data/cms_files/files/97078512185.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/jatamanup.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413a79ddc1d---53029827516.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/dekifirotubokamev.pdf
    • http://soupworld.de/upload/file/73072690445.pdf
    • http://residencecarlofelice.com/userfiles/files/79151577813.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/90fb57694b43b575549d7e0f4e612fd4/zovobawesolaxul.pdf
    • http://melabo.com/upload/files/72330278498.pdf
    • http://geose.ru/userfiles/file/kifowa.pdf
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/28826002611.pdf
    • http://khyljg.com/uploadfiles/files/bobudedexixinuxugoxi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=injustice+gods+among+us+mobile+apk
    • 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_off0000d810.bin
a07fc05ae58c18d675d77de48407324759d3ab47ae1eaf0aeb93b9dbd23b55e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 11172 bytes
font_01_sfnt_off0000f1c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 16792 bytes
font_02_sfnt_off000109d2.bin
7c793b15f8e1bbbb2bc021efb9583bc633e7087b733fdfee2babea7d7d1b1130
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 17416 bytes