Malicious PDF — malware analysis report

Static analysis result for SHA-256 84487c49143bd0e8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 19:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67fa471b30252e7cc6ef1faa0f55d2cd SHA-1: c01c1ac3ed523f4f2a6a9028d0f28bb8b6c590f6 SHA-256: 84487c49143bd0e8ef10f50a863e716c876fdd3f84e488ee85d375efffc0f281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://ketchas.ru/uplcv?utm_term=crash+of+cars+unlimited+money PDF link annotation
    • http://cga82.com/admin/File/32894276031.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/36255652489.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/72344067435.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161370c54bd1f5---48026348424.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/dawiwonimur.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/ledadigogirul.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/49204129293.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/45556051685.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/16740130075.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161409c8ec2ea6---11313263404.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/neduwulunejepodudiro.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/42259657029.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/42954724278.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/60668905115.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/56845051137.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/60881486856.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/42780143882.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fetetorotoloxapowu.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/zodujawetalomopidanugiton.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/43187085372.pdfIn PDF document text
    • http://sparkpro.lv/content/file/nurekelem.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/47479850755.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/943bf54dd87b6bd3d006dacd921a437c/83265545122.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///47431399830.pdfIn PDF document text
    • 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_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 17044 bytes
SHA-256: d8400259dcebf996a871019a92cf7add77be9af308289dc2395a61b15c6f7da1
font_01_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 10984 bytes
SHA-256: 13cb38fa90e17084303a70ffcb5c81b112d71200b32bd5558a3f31179fc25214

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