Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86472c4d4dc726e…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 01:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc2a05b98db85b0341da0b4c487b93c7 SHA-1: 70679d46786667f9d638179ce6a758cbecacfe7f SHA-256: e86472c4d4dc726ebbd20cf727752ec47616e712e3173f2e481ee8ab975540e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://jfkanacon.org/data/userfiles/files/lifowuvigozake.pdf In PDF document text
    • http://bearings-home.com/userfiles/file/75453203356.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc6ef3aa1---lakogadutisutefagurabob.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e5463c7f---26408532406.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bixisuretarinazuzufebogip.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/wewazifabezudonoparonaju.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/jijeniwoviwema.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa53287c64---26027319400.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/69294391670.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72745780fd---35831818261.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/sodikedefatog.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zimubonakomiket.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e4b13737775c256144e60b118da2c16b/namopi.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/47619052942.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/6gt48ijovoj7jnj49vrq0adj3p/buxonafexavovisakegebep.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/57388120422.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbdaa60182---80114565163.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e4ceee345e55ae21af1ad5e10cd25a8f/kuwixaxulixakupe.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/fupegiwekewanu.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/woloner.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/birelalivenewolinogofibob.pdfIn PDF document text
    • http://df-foundry.net/d/files/60634662662.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f8a61c7f074488b5cd79c18896c24b36/51396332378.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6397c74fdc---xobamerebukewanaxilodaz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/12202de8bc2b33eee08cb70e8bb314d5/73955494721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+new+music+by+davidoPDF 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_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10840 bytes
SHA-256: 847128cdc0615c3faa03e266c1c390975adc47ade83ddd8a33de4a0dace62406
font_01_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 17188 bytes
SHA-256: c05085f701044fd15856e5adc8ccee3a0c94f7ae8247d74d8bac5acdb2a6bd5f
font_02_sfnt_off00013c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1