Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f76f81ef1cdb2d…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 09:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10295cc1bf3932b727907029eca84eb SHA-1: c5354f19b58047f15c2378ea60c7c6aab14720b8 SHA-256: 41f76f81ef1cdb2d124c10ae84ab8b4816033d9ce1ac9e11dc7d2f86acbeec06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest the primary goal is to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=verse+about+slow+to+speak
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/ecd3cdebddbf3db2f6375b0e50409968/tasepexuwejapudila.pdf
    • http://a-swiss.com/upload/userfiles/file/275215823.pdf
    • http://olympusflights.com/files/files/44830115609.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb1302792---82499745217.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ed042aec---jadefumunija.pdf
    • http://iglozawiercie.pl/zdjecia/file/wokijarokeji.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dad357fb0---76054385647.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094749e90ea9---30449475355.pdf
    • http://nfrostov.ru/upload/files/49986539545.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/f39f0ea4489d84e2960678afc8196cf7/17545866300.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/ritixiwukotodajofudi.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/bujotifuvaxewuvud.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083afce9141d---1866672598.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/mezeximoxisetozogodalebez.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97ff883dc---kalugiwovubizus.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607892c1d2b30---17605553675.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34150e6cf---narixegegujuwesazavuma.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87ac4b58e---zodurofow.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3dff9b6935a96e84019f74b066c10899/14923868713.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928fe2043c9---donotigetax.pdf
    • http://sun-eko.eu/files/file/94305595221.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070d60e1251b---dexikatejafe.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6cc4b963a---98173736792.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea4b03bd46---52503478613.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_off0000ec83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 16792 bytes
font_01_sfnt_off00010495.bin
bdee75fb32eccb4175559b1001d72a5507bd6bf436ce2a4bcfd858ea201fe763
pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 18088 bytes
font_02_sfnt_off000132c7.bin
fcb3bc877bbfbadbf7f5325e335326484d779b6da7c976f0ce4177e7c8e523c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 10436 bytes