Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bb87194761efd1…

MALICIOUS

PDF

107.9 KB Created: 2021-09-10 18:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b78ca2b81a67d02722e963a22b2fa67 SHA-1: ed11a6e42354cf69c1ef03ffa146714cf2e945e0 SHA-256: 17bb87194761efd1dbe73bc94c302a606664a958c4a4ade99a9c86ba9aae4899
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of 'cmd.com' in the document text, although obfuscated, indicates potential command execution, and the ML classifier strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://baigeleather.com/userfiles/file/sibalatadipit.pdf In PDF document text
    • http://pokemom2.com/uploads/files/zusezazunibunur.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/57164825335.pdfIn PDF document text
    • http://szjg.hu/images/file/86165399806.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/066d157bdbb3537b965e8d204a035cad/melebuzowelajedoduw.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210911000952.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/40293771816.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/ritisolamovajufapugazapu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/52842185721.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/54503949037.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/pafokewu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m3tkgfql0hemm5qh79jka387ne/82874387654.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc1c0237b---8946316271.pdfIn PDF document text
    • https://iohrp.org/f_files/files/52083974419.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/55037325473.pdfIn PDF document text
    • http://pololanna.com/user_img/files/52808315289.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/63521988555.pdfIn PDF document text
    • http://youil.org/userData/board/file/fizewinememo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/63697360866.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/deradijaludeki.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/29008100343.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/rozezaj.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/wefevenawatubozipizi.pdfIn PDF document text
    • http://qdcmd.com/data/files/26744910602.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/lefopepizomojozujovimexok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+of+grey+full+movie+free+downloadPDF 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_off00013bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D0 19780 bytes
SHA-256: 6d54765e4ed1d90bc41837eb8434345d9c71e9f7096b926c4a78c5354c971adb
font_02_sfnt_off000187f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F1 11144 bytes
SHA-256: 47a069d685f92de5cd4a38b185b58447b240e6aa6b634e86bc63eac1a305bf55