Malicious PDF — malware analysis report

Static analysis result for SHA-256 a321d6d3d1edd57e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-05 06:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bae17909977ffe2e5635ba79fdbe02ae SHA-1: 398328934593af3f6f116964ebd1d8a82da482fd SHA-256: a321d6d3d1edd57e02897e65a1082ab215f0264ec402999f43dbeff2ba3adfec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=partograma+oms+pdf PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6e031872.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612175e3941c1---viwilonojedeleperaminire.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/jopirexalonaxepuwa.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63be290ca0---rukimoz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822f500bd61---dumibadowu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/foduneja.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/90254558227.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/17345686314.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/nusikigeraja.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ifixumusinez.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/kolubusiwirevadese.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/036640b8fc9c083fb88090847fcc4022/xojozanuvonuzawod.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161184eca71a99---9964367271.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e7ca37b6154f714cb5f1e9854b23405b/modor.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/ganujoguzizotir.pdfIn PDF document text
    • http://jn-zhsc.com/upload/pekat.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/wopinabedawixedusutafuru.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mikusopenujefaxuferut.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///18776319180.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609c239471ec1---xugaferuvodip.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/98453423021.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad22297508---wefixofusidoxewepumafex.pdfIn PDF document text
    • http://terrietanaka.com/library/files/73493167127.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/bejasipiwuba.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-5/20210605032553763164.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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 15520 bytes
SHA-256: 3abaaf924c786a80dcdf3f66e53795fbfe11f420de34f1d8dfcd0f9adae9907f
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10468 bytes
SHA-256: 9b2dd3bae4e3e00f432f2f35eb627e4b02b0048509fd203a46a47b043a86ca20
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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