Malicious PDF — malware analysis report

Static analysis result for SHA-256 f470509290214842…

MALICIOUS

PDF

92.6 KB Created: 2021-09-13 23:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54ef5a5a29694e7b086ff07619f1b472 SHA-1: ec840816e61712bcf9b6b7fb66fb6559a946e78e SHA-256: f470509290214842e0fb685028db0d2e86844bcc94dbc8c8d87ccfc71a490041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to act as a link farm, potentially to improve search engine rankings for malicious sites or to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://medvor.ru/uplcv?utm_term=halo+spartan+assault+android+apk+download PDF link annotation
    • http://hitecds.com/userfiles/file/kebupemesu.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/viwomopagumiboxasob.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/23534095022.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/zuweramivezadavirirake.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc5ab103c---gabeketekafijowipitupu.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/jagajulixazexoliga.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fabamagobizipuwapo.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/93261373675.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rojamuwusafojafigexax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161393f13355aa---35973193305.pdfIn PDF document text
    • https://lordoptika.hu/files/files/7861831060.pdfIn PDF document text
    • https://guijek.com/userfiles/file/93843276044.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/41709515053.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/47216037409.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zabufosolukijidil.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130db5f498c7---rafujekitukewapumilano.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/ledobuxiriwek.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wuxibiwa.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/gulinizutig.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f285ae20b1---zikelorudalafigar.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/bifukuxonovisiju.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zinipiwibonexozuloko.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090328236951.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/47949015532.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/xigukuxegowudafejakesit.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/13205906723.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_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 20344 bytes
SHA-256: 1350a3d3df5d70dae21b5e42c52384a11e463768c9f1ac013725c6d3f21d01a5
font_01_sfnt_off000133f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F2 10524 bytes
SHA-256: cb71d954797915bd7d5eb302e32a2518ca23f97dda58d001fca7cdf63b2cdf93
font_02_sfnt_off00014c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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