Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43b11f3eaa17970…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 06:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a97f595c3dfc17d68d32cd37c370b474 SHA-1: 4b9bd4d52530c88a6448a5bcc510707394e3a14c SHA-256: d43b11f3eaa1797003396cc480c29176856b48b582517359d96f90388e219c9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-like sequences within the document text, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://telorgabus.com/contents/files/87791883557.pdf In PDF document text
    • https://kcss.hu/korosi/userfiles/file/xamoletanimenudono.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bidopititotizonudar.pdfIn PDF document text
    • https://dukupahit.com/contents/files/30305918831.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zodufimiwag.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109111025134004.pdfIn PDF document text
    • http://analhospital.net/file/files/41549074822.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/nujupage.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/72592578689.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfd5918b4---busofelojekadis.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xujos.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2d80e7a5e7ead90fee062564b087099a/tulebunomijetixajo.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jezebotedunixesovuwiba.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/93522346433.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/93348506697.pdfIn macro / runtime command snippet
    • http://mynigaoe.com/upload/file/20210914070352.pdfIn macro / runtime command snippet
    • https://tekdalyapi.com/upload/ckfinder/files/wunotojofokovejusapefen.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/921fdc6272a0513d510f095ab05ecbf8/xefes.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/nazez.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kazoxuvezazopewegajax.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/95972169568.pdfIn PDF document text
    • http://fteq.ru/files/file/wofopaxod.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/menozewokepuselagufukez.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210914100747.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/63495031786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=type+n+cash+app+androidPDF 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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 10544 bytes
SHA-256: cc690b7081cd2f6c4ddfd4ccef9e9ee5429f231dafea553590ec7a505f22e44c
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 19136 bytes
SHA-256: b93e6bfa181e805c527616b50c7acb5a2d465d95d987610c607d64c564c984ab
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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