Malicious PDF — malware analysis report

Static analysis result for SHA-256 2110442c377be178…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 06:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c23525b55e2f2a50b71f7630747a9613 SHA-1: 7885ef404b933c52d2b6972c691438069fe26c32 SHA-256: 2110442c377be178ab5342a63c693f1e7eaa32ed990672a8b7eeefa89e8b1381
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pu6q48bjpur8k4qr117air4m02/vopofewuxalupomiguti.pdf
    • http://openendrep.com/userfiles/files/29651025373.pdf
    • https://steklo-shik.ru/userfiles/file/9397566824.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eeb17ffc691f5420b8774b58484f3e25/63562817177.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/xofekorowiguwu.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fj0b42rl3hfqaqmvclpt8rbdhl/fonalodowopavejirizataje.pdf
    • http://u15.ch/ckfinder/userfiles/files/71629828879.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/80c9f2824445c287987f3410ded1e7cf/jukomadevologuzul.pdf
    • https://mauspro.net/upload/files/99756137575.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/8aqrtcp3vc9gd68hvbm34f2gg7/10010037500.pdf
    • http://wellfoto.cz/pictures/files/83641526258.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbc211f5ba---nijida.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f4f18a58---57632934622.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd64329598---feker.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/33743969540.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gixemojonoduse.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/rujejejetarapane.pdf
    • http://dahchen.tw/userfiles/files/5253306847.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e16fb2bfb95587d563ef6d0bedc9f92/mododowojibakeka.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4c343f20---35891519509.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/jopaj.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6f78ceb55199e35af261ef08d68a91e7/zotabeze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+change+word+doc+into+pdf
    • 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_off0000be4b.bin
cfcc9f47247b6234da30307a299b2a64c8af3175fdb87227ba5a7ba3fd3f0bb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 10760 bytes
font_01_sfnt_off0000d6cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
font_02_sfnt_off0000eedf.bin
1377d2dc81abc6a1432b41a21b08fd643844bb3f3391cd87f63f19d1d18a71d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 17068 bytes