Malicious PDF — malware analysis report

Static analysis result for SHA-256 798bb8769a578db5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 18:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52b323f6750e2216e2529a89b405e927 SHA-1: 3a0521aee58765e49c78a03acada56bbaa92a882 SHA-256: 798bb8769a578db55d25a7883801312037cbb600ded59ce342eb6ace506dd210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sdds.be/userfiles/file/diporaxiwomapeboxekuvit.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3d3f3fdc0c60d47644003c9d9d91c31e/xavob.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/67746599412.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/47616975689.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120432bee59c---xupularodepo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4212354672.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/dorusuvijukenadadop.pdfIn PDF document text
    • http://hotstamping.pl/files/file/venafoli.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/kovulogexe.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/xubematalinozesosipe.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/niwulegibodug.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/96168789501.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e516cebdb---98486106831.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/katefiwotijur.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/87omdn84gaennnag2rsctandfr/pidoxigijusanavonon.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/96182084716.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/58388397716.pdfIn PDF document text
    • http://guowangcable.com/d/files/lilabalunokalon.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/88897740876.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/34221070205.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46497edfa8f7685358f7c600f695717a/jidinev.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///pokowuxevifiv.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d18f384de525a6c1fac48dadd49ac304/59874649047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+pdf+to+text+using+c%23.netPDF 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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 18000 bytes
SHA-256: 6ee1199328a25acc71ef075b1219ae159c352006bb8f533b77eb9e13f5419b1a
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 10888 bytes
SHA-256: 64990dc2a862c4a19ad7deee6a1a04e0b07f311b7e0dd090490b514ce9c3864b
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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