Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a2653abb5d235d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-13 09:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2f39833a15479b73f1391bb841d53054 SHA-1: 42ca266ec3ddc7178bf168cbdb73dfb6a3479320 SHA-256: 83a2653abb5d235df4f006e3de7b29b079bf9babff6042d4520abd6489b2045c
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3658

Heuristics 5

  • 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
  • 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://mexxeopaint.com/upload/files/91120992593.pdf In PDF document text
    • http://nenayu.com/filespath/files/20210909162819.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c153483a9e---55831383201.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/wasuvof.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/74764242937.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/zogifelizasa.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/mufololiwazoxineka.pdfIn PDF document text
    • https://isleo.com/i_photos/file/lesifavewekokebule.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/47190730916.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7c90b3e13a6fa25dbc22a892f6a3078b/31435719569.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/50823105362.pdfIn PDF document text
    • https://bataretak.com/img/files/file/pubotowaba.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99497222303.pdfIn PDF document text
    • http://bienbao.net/uploads/files/zadiwifafefipigapet.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/98977401728.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/kilugenapunobojafi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4738b89f3d92390a30f5dd61c016692/68022420887.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/19033070487.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/da6085cdc800bdb9e44c46cafae10597/vamejimizaxefonujula.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/puvutamumagabunoxa.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/xubadasutezuwot.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/mudikufefeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+guardian+movie+full+moviePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/86534627086.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 10664 bytes
SHA-256: 805a92509aa6ef361e9d5b1c6f50b5eb55dc795158e714c4f6afe1733898f3ac
font_01_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 17976 bytes
SHA-256: 015295530227a0416f7f2d9dc22c5cc40c35775dcf176b9c3e72101c48f30263

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