Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b5f72aba45d87a…

MALICIOUS

PDF

115.2 KB Created: 2021-08-02 05:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5cc2b8465062a41968013840a95de52 SHA-1: e29ee110b797f3f4b84fdfd9f92ad28518c6f7b2 SHA-256: b7b5f72aba45d87a4e8b76fed1311866222e4ffe051427db850391137ee112b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wsp.pl/userfiles/file/76667284372.pdf In PDF document text
    • http://blesk-stroy.ru/userfiles/files/dumutuxobutovagemore.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tuvoxojuxanubopegodivug.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6088ed869---77297746144.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/69kni80rn49tqatqr8dg43o1b2/pakunuluwadaf.pdfIn PDF document text
    • http://vtaky.sk/media/file/momanutupadufajadaxepegin.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/18029701617.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xoxakebofalokibunowepopaz.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4ce45a6586353b8f2d59c640132ba70/97013573387.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/posetibimolobopeti.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e6e0f6dd---liwenivibimirirosi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160849a14d4c13---80850114052.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf1c8c79f---waxogitosi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a513b0c016d---85841321602.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/16322730899.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a170984d---sepebulenizonenimip.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fixedutekefamisubulo.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/damaperimedezuzi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c85gdqpfpq0l3ofpl58qci0mfh/17348323906.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a3a755bdeb977bd86444ad13201c4e4/pabazitaduvefojukuzi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c903a7e18f642724ed5df56ba71dd8d4/18545941306.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lotqnhb11qrno11f4udj598cg6/jelozoziwaga.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49348282389.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160799ebf87131---2834617120.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fovilapupipomajaxu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f227dbb8a---53513784489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dil+ko+dhadakne+do+mp3+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_off00015d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17565 10644 bytes
SHA-256: 7fba5102125cc882b0348fe2bf3c7cc3df6c24c25d4b7fe2a9da452c9f2607d7
font_02_sfnt_off00018d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7C 17900 bytes
SHA-256: 09e53f7df5b09d5fba31102e104630d6770a9005b504f1ddf23c8aeb12126250

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