Malicious PDF — malware analysis report

Static analysis result for SHA-256 9105a548b8c67c79…

MALICIOUS

PDF

89.2 KB Created: 2021-08-01 17:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d68b821260909410a88f2ab60a883f65 SHA-1: 19eafdcf8712f461183088f672b09d40c8218b14 SHA-256: 9105a548b8c67c7913c8d9e2deafcb82ec20e742ee4b3a445f0e5cacc9c0965f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and embedded links are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=what+size+file+for+455+rancher PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gboga7bttlr0kb83mrrkfbsbs5/dagitedowon.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ogp9dutfg316ffpjoejj9kisns/76810132696.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/sadoxezilitovatuxiwaza.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/fetaxefolikemuzexijubifa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fb81fc27---45778889944.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608310aea331a---suwitepamejorobutos.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1927fb0a22---26690617584.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4b3660d098c70ebc33fdae22165826c1/sesibaketadafuvubopozi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/98e2bdbae3bf49f73741723aedcb1194/28108424638.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608df66b01a14---51052971157.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080971f0c9de---8688785561.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/7267424779.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8b82f844---5414931514.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/25663561804.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8574933fd34e9bbbb4e24383cbcc4d95/wemexabojexofurodamazobij.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934ad8bdb8---32926753937.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/662b0c5cdfad049a17c55fe173f81798/48102206198.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/57293009629.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/52e115969264998e1d1cd93faf291c44.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8j4o5lekja9jod97i9s0n5j3rs/27264327646.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/75266469898.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/javixogetuwadogubef.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_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 17344 bytes
SHA-256: 8cd7309ec6749992cecea8f9846849a8e70e94c0bbf1e279312ac89c8a24af2d
font_02_sfnt_off00013e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 10700 bytes
SHA-256: 63dbcd6f5033dde410b58ff92c7571c98bffbfb8cdf92da9d4d72c4449632f9d

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