Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73cb83f38d4cd9e…

MALICIOUS

PDF

96.8 KB Created: 2021-09-08 11:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31fd640488eee18bcbf129cc2b395c1b SHA-1: 67dbfa8faf7319e8fbdac426eca6ae38c1ad62c3 SHA-256: f73cb83f38d4cd9e8f826a58b76c675d033bfa8c7959c0552e3e6478baf43ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URI heuristics and compromised CMS upload links further supports its role in distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://coretry.ru/uplcv?utm_term=bone+setting+techniques+pdf PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607438f2f4165---mikoduzugixegelusigofamis.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/butajewube.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/98762553327.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/54992824818.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/70632668448.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gu1t4vff1jjcrneuutial24lpe/gazamowogosefugabexusabiz.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/25673573616.pdfIn PDF document text
    • https://kimansion.com/uploads/file/popufepazif.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/wefavazazukaguf.pdfIn PDF document text
    • http://fkhd.cz/data/img/25082570914.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/5337572547.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160df77849610b---mozakumagiza.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/20390704636.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/linosejizonefababo.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/74406086890.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/farapufukumaduvomajevitij.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/rikije.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e62b6bc95fe9f76f582af5fe239ca645/wegovuvofusobuvesutenamaw.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041447d547---puligabopujirilubujupine.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5da2e703---60093770071.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e49bf68389---tilizafejojenabugojezi.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/db7f183d6551925baac5dd19c761735b/59066575679.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wivoziguxerokivututuribuw.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dabbe7124c0b44155439737fe73ca1be/batejutudoxipemada.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/nefuxezijozufume.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/84866864799.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_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10888 bytes
SHA-256: ae091f686c2c4b60f24d9b4a930e500a6a7d4b5d6d5eab8cf576197eb13ee5d4
font_01_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 18712 bytes
SHA-256: 2299b3574386d5a57188fb050b09d4d87675e306f6ac6105c54d67e5c78a60bd
font_02_sfnt_off00015d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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