Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc0768a26e35355…

MALICIOUS

PDF

81.1 KB Created: 2021-07-18 06:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99d62b51b0cb56d02b1dd001d66cea7f SHA-1: 7e4a3fd51509bae4f03d2096eb4d17ed65001b90 SHA-256: 7fc0768a26e3535562a6bdebb5736769817f730184c7e3fb304dcf32503ed267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://magyaringatlanadatbazis.hu/dev/_user/file/85449900806.pdf In PDF document text
    • http://china-zzld.com/uploadfile/file///2021060920352940.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/ketas.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sufematunifixiv.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3fe5eb84---59598495762.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/84514554706.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/96bff9f328108f1e1ad26a94f054d269/xuwuzozuxobuwuvodob.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/5vdq3tvfifvcqbpnov3lc17m2o/mepunu.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/sewazezoxifunuze.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/nusonofum.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/webilaruxuvidasewol.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10367f554---66363004680.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/metomaxikopibetezuvivixem.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/kizaxufivuzizenikij.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9fa0b3a0---xeguzule.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e24817bb---86338088068.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160be902ea566d---27043173999.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210626/file/16246741668108.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a1430fa5cf6a57304c909c769efe09ee/vikobiguwatule.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210628002016.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d4504c287f7480fa06c30ee45523a7ad/47102523718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=learn+think+and+predict+through+astrology+by+cp+arora+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 16740 bytes
SHA-256: d8dfbda2394fc8f3780b1a7ec48afb05d9a334fa984cdbdc5cb17cc76f34ba7d
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11304 bytes
SHA-256: ff963c99071f70f602d644639165cbf1916a2edf7392f6e0da3eaa648ab3e80d
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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