Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c4b35e3c02e016…

MALICIOUS

PDF

85.6 KB Created: 2021-08-25 16:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2af6c2e041b4a73e412fafdba183a047 SHA-1: 978ce9d3663ce340d76b0fb499ad1690d33d40d8 SHA-256: 16c4b35e3c02e0164c2032171cd1bf14d1bc96f1646770e2628e39b86c541a99
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of malicious links to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160890e21b7341---64843962834.pdf In PDF document text
    • http://ebrinteractive.com/userfiles/file/nobodelalirimaxulefeduv.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b9427c96e9f2e825b9f29da72f8df677/91345628710.pdfIn PDF document text
    • https://andrejc.si/files/file/rabolesotiwosavavikutas.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/96684914894.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/12329724859.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/pitikefetolav.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/32800337931.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf05b7213d---42307321842.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091788085701---40236454363.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/bojudilefarumezogime.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e49bc114---21728678740.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/mefasinifakunutiwiron.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16071830c09155---jepezaba.pdfIn PDF document text
    • https://brs.jo/userfiles/files/madez.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3832849d7c---baxav.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a817cfda6d2---89788932404.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6e17abc80caed1c0eafc7a0e04bfb56f/33245497283.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/gepinelugusetev.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed1297119---nusedunozevetifovumonenek.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k7a1vjkjq71dmande767554ln0/vegewadapov.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kizugewis.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/movetesig.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gubipibiwukodaloxulawim.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a29a0657---73457185879.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/lelegufusogamuzezajab.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/dupexusolopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kane+and+percy+jackson+crossoverPDF link annotation
    • 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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 17092 bytes
SHA-256: 1b5932bd06159e463dc48c06ef81f80e4c2d843d6a04c148f3ca6e19f6c768a0
font_01_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 10664 bytes
SHA-256: 728671512dd151bfa682f9eaccfd6095489e2cb186dca2c4c662036ac5b1d5f8
font_02_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1