Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0749a33fd81cb0…

MALICIOUS

PDF

88.7 KB Created: 2021-07-17 06:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd5c93e3eb85880a1a1c4dd3af621a47 SHA-1: 0370f14769f87f15d5b0bb1b6fd8efdc3c210b07 SHA-256: eb0749a33fd81cb0e5dfdc8043bc778587b3bd9f467db572be79f2fe55fb7bb0
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing purposes. No scripts were extracted, and the document body was unreadable, but the link farm behavior is sufficient to classify it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://volamtuyetthe.com/userfiles/file/71493986999.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b5e0b962---rotajuzimopisepekaruxabop.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/deparananizevatozus.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072394236642---nisasujegogapusubuxebela.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/25135987594.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/f3fdfcbeb76b0cd3533f6b585cb75d6c/13329358349.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/719281724.pdfIn PDF document text
    • https://auto826.com/uploads/files/10366886142.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/navasuzivopavafanito.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/1545372466.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/98693705123.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/21372120189.pdfIn PDF document text
    • https://maturana.cl/upload/file/bidumojuzonek.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/31102144898.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/73de70b38136d95b17e99bb18614a167/tufileratixufogu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977987d559---tupopezufujawozo.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f331f8be---kubonetila.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/4131654942.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee44b1f313d---pewafuleveji.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90dd26f333---rexijerudadu.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/18756211011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=example+of+a+primate+cityPDF 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_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 19176 bytes
SHA-256: d2fe34d13ebabb10a6b81b965ba894ed1fc0c0672f57714029bb4693b38276f2
font_01_sfnt_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 10568 bytes
SHA-256: 1764ec77613ffb851ae0f6fe45b7ef1d54526441d74c9c5c4b400f136cadce7f
font_02_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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