Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df09524785e5224…

MALICIOUS

PDF

90.2 KB Created: 2021-07-31 20:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7f7c725b280c95f2a57a86c2d1cb89b SHA-1: 560700394a82020f18d417ff83fd47ef8f971390 SHA-256: 2df09524785e5224275c03073859156ed8a9e17d58a91c632c0070a5b46ee1ff
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and heuristic firings suggest this PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://phuocthuan.vn/images/pic/file/73638517916.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070067522775---38149377687.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/gevufij.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa972f29175---kanirozokom.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/fatumulafitutojudidika.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/37080531889.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1abbf06f9e1f163a51343bcc9d50975/56649016217.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/gilirupabeve.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/basom.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/73048126858.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/17534661652.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609621be9177f---wilifivenuwokogifiwepen.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ojpirpvlhmrn3gp18knfvv4vfu/99106048071.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8352a4ecf4d5fe052297eaec7174acbb/jixelixusikobatibuzi.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/meremesoxiwezazusu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f646e85f7f---keretisupimedipigu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bde423e85---87276242937.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/57808623194.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3d6a3b370bd2a832e1d952eb965a9d7a/20130816931.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/50003206440.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/kiwiverilo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210719_521E2357790891A1.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b17d33a2ca2---70787153070.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/26646202465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+to+cook+a+turkey+breast+in+a+showtime+rotisseriePDF 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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 11200 bytes
SHA-256: 19a107fc7ce1dd482991c7291a6715c75bd036e3ace48556fe8fcb8056aaf541
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 18096 bytes
SHA-256: 49afc20794bf8eaac570ab5d5a876ef688e221f62e76156640610a3f3ebdab22
font_02_sfnt_off000141b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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