Malicious PDF — malware analysis report

Static analysis result for SHA-256 e350d6c640408f9d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 06:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be7c5b94cdf232521fdb97a172184039 SHA-1: a95d61b964e88e1d4c8cc69dc1ff8b6cf3edb2d7 SHA-256: e350d6c640408f9d7cf4056a7eea6ed134cda74bc18f710d4515b28bcafff8d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://ihdbd.org/upload/files/13460215106.pdf In PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/natug.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/51392701908.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cfa30661152294bf8a0033b08905a967/wonolujimus.pdfIn PDF document text
    • http://baove24h.org/upload/files/lilijiwi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161304bc375e5c---14029739246.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/62014675047.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2e072735---kagozibedozot.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/rugoxuwewezurani.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/dirajumajudumikedenimifa.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/21156544502.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb49e8bd8---jejidajixemokexo.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219165417.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/18418811772.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/bodelobatolubusafiluz.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/televogetigalatipapamipuw.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/58925291521.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rafufudujunazobo.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210921124955.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/takeba.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojigujoxidikeriz.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/zegax.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/42859870493.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/pidegapukew.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/nuripomalidelotevafo.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86275521300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=year+4+english+comprehension+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_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 17772 bytes
SHA-256: cbe22e765cca77891e10ee0e8b3f2470a22b0d05ab4e073e1ad209361d38fb25
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 11028 bytes
SHA-256: 9a8755a4d4849c2d26d12811b1a6617c50aba28cd4c94f4a5852a6be8801db3d
font_02_sfnt_off00011b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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