Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b7541d0e0b568b…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 10:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c23dcf6e6f5d953d52a5eb88669f3a32 SHA-1: b5fd1f4bad54f506af6e8fdff06fd2acd0ed7f8a SHA-256: 30b7541d0e0b568baca52671c1fb1a5c6f17075f8488e392ae4175e514ee84c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, which likely serve as a link farm to redirect users to malicious destinations. The presence of these link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ketchas.ru/uplcv?utm_term=post+hepatic+obstruction PDF link annotation
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6fde7935a---10160441682.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/hihj1rhcoeeatl6t1g30kk4nud/fobelezujezugidizadogo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa1a6f21f---15426208228.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/42136310927.pdfIn PDF document text
    • https://invest.pl/userfiles/file/ruzulazutug.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/73b642ed629876d4f136e0c92b07c014/98211081369.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084389e81a08---72964944647.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078990982e5b---paluwipal.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/makevabowosedonofiwofoli.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b350dc2aaf---19735764130.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/gutewogevelasanupino.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/99394362196.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb956886---31025585222.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e53bd2bed---46884579007.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/73905543081.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e7ea29c05---lifen.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608697cd6355e---fufalufetivozu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/92057147734.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d298458870e---komulewup.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a214ff2da3---79969390820.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/luvirul.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 10668 bytes
SHA-256: 698370fc93ffa3facd4d6bb764051f75532a53f91e63254b6c6557d466a18246
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16684 bytes
SHA-256: 56851dd6215e978baa48d867b5e44559dab011d5c0e39e27e771dffa19f7e285

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