Malicious PDF — malware analysis report

Static analysis result for SHA-256 a959b07e0a0faa22…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 08:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6781d075d2575f69fd5932b79a21a40e SHA-1: 3bebd080db7feb920919853a6f2e06e42fc2ba95 SHA-256: a959b07e0a0faa22eea66cd54cb383b5ef537f8e08f35d330d4eac209fb96b8d
196 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The 'LOLBin_RUN_COMMAND' heuristic firing further suggests the potential for command execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://ct-tci.com/cttax/userfiles/files/93977280897.pdf In PDF document text
    • http://yh-nutri.com/filespath/files/20210909225249.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/7433588852.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/24756654680.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/kevifowa.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/bufiwedotu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/89692117982.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/fobaxedade.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ug1cdotgogh33td27cmd2hifp4/38169261846.pdfIn PDF document text
    • http://afro-safari.com/upload/files/90152225128.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/debezuvesonix.pdfIn macro / runtime command snippet
    • https://birsamundapark.in/userfiles/files/24199757289.pdfIn macro / runtime command snippet
    • http://resetimpianti.it/reset/public/file/gatovabixatokilax.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cbc86947e62de03abdd19509b52cfd24/73343474040.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdf6b3a4e---fogepofivokinusonopas.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jidigofigipowax.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fudobuxusedekisozekexufu.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pumipup.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/99363290409.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/turukelewofer.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/wifowedezokijisa.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/kupowogizu.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/gibozanifiwapujivugadun.pdfIn PDF document text
    • https://taperagi.com/contents/files/87557598700.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/49573431605.pdfIn PDF document text
    • http://afro-safari.com/upload/fileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bus+racing+game+download+apkPDF 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_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 18104 bytes
SHA-256: b4eaa69552a36728986ae314869e18692ffecff6766c1085a023d580b6c0c755
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 11088 bytes
SHA-256: 22f01fad8a1fcb0d70cf83b82f80381d9c8c91c89b3fdb8c8e06dbf5373f1717
font_02_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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