Malicious PDF — malware analysis report

Static analysis result for SHA-256 456181d31992c99e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 15:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30a30552b827c99a75eacd2a7d0d52c5 SHA-1: 926b62b732a121a4251dbb74ceabc26185229349 SHA-256: 456181d31992c99e64f3bee969f0174321f67d09a23c726a86ae2968b6e93c9f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krakow4you.pl/krakow/files/66423268153.pdf In PDF document text
    • http://podhoru.cz/userfiles/file/94111199897.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fidofiteputunobonun.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/sixaxoteduwapexulevude.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c77e2dd0809---pidipizunimufesus.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/61148178899.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/81139236339.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/32303328149.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jizakixunuxegi.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/73551571257.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba2d567a0---pakipozavowavive.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/16223180638.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4c86f27909002e7dff3dd063c3452331/ririk.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/xuguguje.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/48035266208.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/559597f21e469684445a37606422b26d/madagox.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1620298230394.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pixum.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8dd56b875c7efc17a60f5dbd4c32ac8c/fipune.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/lisolosotare.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/7bce39b90028b86c139cc01d6a6a1880/dubof.pdfIn PDF document text
    • https://scalper.ir/data/files/file/83113236496.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/28473328488.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/97503435388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=microorganismos+definicion+y+clasificacion+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_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 10972 bytes
SHA-256: 2165ebc2e454cedf313dc76aa845cc674998f3bbd8023b5ea0acb6eb7cf53579
font_02_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 18532 bytes
SHA-256: 60ffa9b0122c272acc99b29f752b3d10b0c7d7d50e48791b0bb1142780bf01a9

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