Malicious PDF — malware analysis report

Static analysis result for SHA-256 79748f9ef7bd5625…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 16:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91bd39dc4ade09a7709076a50e54b8f6 SHA-1: 105bfc8e12fadee29ebee8ecdd83963f8ba3f22e SHA-256: 79748f9ef7bd562562e08999f161ad4ef30ddb6c752de49756323486d01e5615
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the collection of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/65104162408.pdf In PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/zurekojozosamevaro.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/62796215103.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/lizesetavipabimigor.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xazabiwebulefe.pdfIn PDF document text
    • http://christopherdallo.com/file/49048774757.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161307da8db977---11425658615.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/35930380696.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/87864909354.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/95902795142.pdfIn PDF document text
    • https://domilot.com/uploader/files/leromamebidusis.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/87704295227.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/27259008477.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/73046273539.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/2596918745.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/693ff9524b79a0fa39f9bfe7c2da1991/57572246006.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab3ff220e---kakenafogekamaxu.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/57496519578.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/72472410564.pdfIn PDF document text
    • https://shevian.com/images/file/2925353260.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e6f24187---33276411454.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f913590ea---79101315621.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/tujumarulefaweralilo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/15519166672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=complete+list+of+android+appsPDF 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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 17368 bytes
SHA-256: f21521353ae48b686b0f928310e4aeb9084ea3e802d7059a9a5deff256c8d703
font_01_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 10692 bytes
SHA-256: 9ca0d0fd64e241d84fb543307d2986219f37f84bfbe298410ffc9755847733b9
font_02_sfnt_off0001336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1