Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e2bc03ddb1b6f9…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 05:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 10275008f7cc110c8bab6d8a29522186 SHA-1: 30d59d92211db4b0608befc8e8b1e3f82b3f4caf SHA-256: a9e2bc03ddb1b6f90b97162ef16c2a44d249b05e5093bb4ebe22f6e50df3b683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ccsl.asia/files/xeremodobape.pdf In PDF document text
    • https://dodomacnosti.net/data/file/lenubesorodabanarapo.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/towusowozidodi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/juzejukop.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/39069102708.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d690481ec---63312038303.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/gubugisuda.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea0c30fc2---7677772361.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/jatebituzazisun.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/3294127386.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c99e3c11---mobetobuvevu.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/xurofuxo.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/sirudomokevabafikixiji.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kidoxiwanibabuvazi.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210904200537.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/93579390556.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e20f7fcc5---90149241070.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/fexekikusa.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/zadimajobuwiwaduloxuxenil.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/52658062752.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/89507119596.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935780ba56---tukobupifamizukelagumevuj.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1jrctaisn83rmhu0noi5lq1prv/gebetizoleroguv.pdfIn PDF document text
    • https://eniedu.com/data/file/20210903130751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=crack+idm+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 18988 bytes
SHA-256: ab0ad89e5376f06c6dc9803887070f7f134d04c43802046378c228e138173723
font_01_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 10228 bytes
SHA-256: 48c998a35138baa647a56aff1b06d1b578095a90729b56bb4f46aaac9c99b66a
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D78 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068

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