Malicious PDF — malware analysis report

Static analysis result for SHA-256 d862da1530ddd3f0…

MALICIOUS

PDF

89.5 KB Created: 2021-09-10 13:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5eaa3ab07f641831421a51d7723adf01 SHA-1: fc4d13810f1e745f10b5fc08864bbf8ef14814c7 SHA-256: d862da1530ddd3f0308c6aa4101036ba3fa4a12658d02a9cc4388b8b4c3daccb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates potential command execution, likely to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c803ca032ea9779e6269a3e9731dc4b6/jexovijolubejadudik.pdf In PDF document text
    • http://swhos.com/upload/files/47496211282.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/muzemuvawolurufagokonuro.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/bamibasupaxifobodo.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/banonik.pdfIn PDF document text
    • http://qdcmd.com/data/files/vejufipazuzub.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/43990115087.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/87214974706.pdfIn macro / runtime command snippet
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d6f6405d---lunonisiruweru.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/81811180984.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/49302027925.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210906_9D86E44A556D8099.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/65005698709.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5a5386a75803d8dcd310fded27e28e10/34804060352.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zipikegeguxirizime.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/81287668755.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/kejeritazisuxufowusiloze.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gubuwuk.pdfIn PDF document text
    • http://sentai.cc/data/file/20210905_100945_248.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/gofikavutipenupuxixa.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/riduvodozeg.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/62679808444.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sujotonofin.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/84091979393.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/92802257194.pdfIn PDF document text
    • https://used-machinetooIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=unlimited+money+mod+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 2128 bytes
SHA-256: ea0838c56c771baac3e7294113a37a869da30c0923c5234740d3ad99157bc88d
font_02_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 16320 bytes
SHA-256: a61d684141661bd7e25227023c6ce57728fecc34f676d4b5e6e450b31f799185
font_03_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 10496 bytes
SHA-256: a98d765e63da4098f35e7faee66168fadd359eb53e16be458e64ee16a448d901
font_04_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 24212 bytes
SHA-256: 31bdef19fc21bd7749d0922982a92f4410219e2d1230f3cfc100803171b590be

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