Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b3a8378e5fcdbe…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d28c050bbde0213d11c576f347957856 SHA-1: 29d392ef16960eab4cab7b9c9277f14a4cf65061 SHA-256: 10b3a8378e5fcdbef76950869821e28a5f2ad1f30aa246a2abac617f64b689f3
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the document text may contain sequences that mimic command execution, further supporting a malicious intent to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hs9krcmop11sfnjkjbse09j9rn/64904146961.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608653bed71c9---fupuwakilevefen.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vekipesozivugitejebas.pdfIn PDF document text
    • http://hydrem.ru/images/file/86112887542.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/dudesozugagudu.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/watusixatige.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/95319422699.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/31hjiarli8firn3af39pu3aviv/gakomimarajugokerapigibu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/wipodirexodizizogafag.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/nodoximijove.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402e4c4990---godokitomutinoder.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/vatudunowujezanamomi.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210609125212.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///migavamalilavikuvenu.pdfIn PDF document text
    • http://slsnn.ru/content/file/63098265600.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sudoxokitefetawakemu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86bb94322---13988338242.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/90873414238.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/73591118869.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/29589149626.pdfIn macro / runtime command snippet
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125db99ed106---wenuzugat.pdfIn PDF document text
    • http://orlickachata.cz/files/files/gawalanigizezumovewukeme.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ml4oe95mmev6lfeno2a5s32hhj/jiwulalame.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/67667190509.pdfIn PDF document text
    • http://airsoft1.ro/files/file/5612881300.pdfIn PDF document text
    • https://heks-tech.com/aIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=math+antics+algebra+worksheetsPDF 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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 17652 bytes
SHA-256: a30d3276fdbe6aebdf1d0e5bfe57e644d67d889fea3d69a7a872269c7f29e715
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 10820 bytes
SHA-256: 0688b1116a3f5bf2faa00c8ae24443ef0c02d7b6ae58ebe6a04187e692e2767d

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