Malicious PDF — malware analysis report

Static analysis result for SHA-256 91372e8e669b1d06…

MALICIOUS

PDF

89.5 KB Created: 2021-09-10 15:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3764995ae5bc8a5b6085f65d340f1631 SHA-1: b86ed2daaf64e9fa0cc030ef5f09c8f28ddf696e SHA-256: 91372e8e669b1d0653c28733ac07e55d78dc6552e318c73366fc19f1e081011d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable domains, suggesting a link farm designed to distribute phishing content or malware. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 https://garglob.ru/uplcv?utm_term=to+love+ru+apk PDF link annotation
    • http://baocaosuhoatoc.com/luutru/files/kededetopaxujogukajo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0401496001630886533.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/58064524646.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f44f986---sijaborudoj.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613344013ba32---68719319452.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/susokejetasolirimebomagon.pdfIn PDF document text
    • https://tigaintan.com/contents/files/51189500149.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/gowiwaxefem.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zowonapepefodo.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/11158712992.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/kitawoxifabadadugejodo.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/tezalukomiv.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192447205916.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tunajorogezutuniletefad.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/fonezatajerokelawinun.pdfIn PDF document text
    • https://scalping.ir/data/files/file/lifixuvovutokukofivafexo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/favijoponinaniju.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lidobupefufifum.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/46578738704.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ffce4252---luditib.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362189a9a2---jetevuvugajojorebejojofew.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/toxowurezokediveretur.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tukitufuwuzebop.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///34686756400.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/makunuzesij.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sozeserivugavulefopi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 10004 bytes
SHA-256: b49bb53eb2f5ea574ce9129ef0f07b53fbe581b259f48aeba25aed26a98f3d4f
font_02_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 23276 bytes
SHA-256: 035e40f84fd54d6a34348846ba3fab8890faf6312bc24e3c7ca41e751693688f
font_03_sfnt_off00014f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F94 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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