Malicious PDF — malware analysis report

Static analysis result for SHA-256 451bcc6e095687cf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 00:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a5a99f3ac5c38a5cff748a408b2f8ed SHA-1: 2e6acbb7b520c674aafdbf27a191f10dc9d8f749 SHA-256: 451bcc6e095687cf2c36345abcffacf818e8d732eb201f21c82624fbf376035a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://modaxch.com/userfiles/files/36148306780.pdf In PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/75406531182.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/jifume.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/fuxuladerepigofoxanef.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gipefid.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/duwowalimapapegaguzeb.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/siviwenaparilola.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/2332398767.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xokuxubozoxivodexifi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/62925267422.pdfIn PDF document text
    • http://labotinnghia.com/img/files/bumepejemidupirupokad.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613961a1cc93e---25418198106.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/rifoxufivo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1a9a9212bb4d0d5aec479e2857b6fc84/53786262693.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/sepev.pdfIn PDF document text
    • https://italvaping.com/file/13510777026.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/xasabupomakejeziruvev.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/35869793841.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/bopowefufakesofavujol.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/3509265369.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/84967041502.pdfIn PDF document text
    • http://citra.cl/userfiles/file/67215656010.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vuferabokox.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/sokimanajaxikurewalojipit.pdfIn PDF document text
    • http://thongthien.vn/upload/files/50272061378.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa1812422f---86028670319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vinyl+player+apkPDF 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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 10036 bytes
SHA-256: 2ea907c463f3f56a6b5e150bca246c9e1ab598c57edaf2f028fba179802f2e2f
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 18740 bytes
SHA-256: e06985ab0ad193f6818e902c300ea295ef829ec3f918600ff76c9faad7c16fa0

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