Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d77e4597a3453ef…

MALICIOUS

PDF

79.3 KB Created: 2021-10-21 10:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 89fa5c135def1ddb73a821dd3c0b40b2 SHA-1: b7000ead6380ddbe200d3e47362e52e1901a1f11 SHA-256: 3d77e4597a3453efda191e8bec22d975c0f87501842afc8088d08d3cc10d0d32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=1+upon+infinity PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e072dcdce0de3d78bf6580f043f1670b/putesinesogoponugezijax.pdfIn PDF document text
    • https://panoramabyty.cz/content/8110549887.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77226646742.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/19931202401.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/55402021240.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bf7ips3t690s1tba62ncr0n25c/64175036347.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210923025229.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pf2dk8cvc087br44ig8r7d20sq/25343171424.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/93641963093.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/zebadipudexa.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/28955563881.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/53992320394.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/9188452648.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/zajukevawuderex.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/49173228624.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/efcbc25f5f454be3c65ff0139d340c96/niligebulizumalovat.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/31696715877.pdfIn PDF document text
    • http://homeopathyhk.com/files/motizawojusubepu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aabf12e193---kotupijalokudaj.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/bagomogaj.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/vivezugilelasopafaxorep.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/rodigegokig.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zufolajafeza.pdfIn PDF document text
    • 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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 9912 bytes
SHA-256: e704f44f25af29602f86056412d2df8e50b6f27b5c2eaf20d8febb357c76f890
font_02_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 18748 bytes
SHA-256: 73d5b5155e1728b6451cfb7e8b0618c934664f6d1911d20a7a04f05f29c50dd8

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