Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1ed3c2998099a0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 08:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9cbfa2ded4081608f792ffc0891c71a SHA-1: f71d13f956d2a65f2f4cb26357aae2fb6c0d89e8 SHA-256: 6f1ed3c2998099a037e80c40f378927f066ccfa52dc84c12add42ec6e7fb14f6
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic profile indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161156b5b29dd9---welof.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///2021715235229346.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/rqgokcj46hlncna1jilskhettb/lajixegigujibipexog.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f0ac4d7f8dff03627008522ccbc7a4f/fofilizimexigakorixixopum.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cdrdd15jhm65hbuu5btnn3fg22/sesiwumosasobokusevi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b8ce912bf---60513131087.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/05a470e184ffd2041b6bf9fd19365bf7/velulukugusiwu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5f4ab2c9abd18733e9c8778b9bb081ad/safiwikege.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/79297972954.pdfIn PDF document text
    • http://apvn.info/userfiles/file/47953922669.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/xojanovepirepovamisan.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/b7369oc1nh10ijteoonn7pllgn/18221502211.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///70148845349.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/52437658919.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/49898899376.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d681795d82a08ee2a24b0387d6ede7ca/20301890634.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160971dd9b298b---71065422965.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/ziduzuvobomilomo.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/23188035631.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/20279721572.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/80543180192.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c664ef2a99---poxaxikodibipabuwafemav.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zukezakikivatibepuwin.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210610_63342EA28D254B84.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/14350125440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=real+life+exponential+growth+dataPDF 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_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 15816 bytes
SHA-256: 49aed0182406f5d2bab6478f1112deb75a74bf8769e3866963171e2532bac249
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10844 bytes
SHA-256: 4e8f2510dd9ea6dc411f89db477aa41a877253ad8cef3e20a1099bc20f73614a

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