Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffe81a7bf8fa016…

MALICIOUS

PDF

86.7 KB Created: 2021-06-23 23:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c84702a4dbc3d3e2c3707cdb1401df66 SHA-1: c91043498b8ed2066993020a0fa0ba722e625ea5 SHA-256: 9ffe81a7bf8fa016015bd08fc410f5fc86f8d68824f5a90e44f39f775c19a0fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns that leverage seemingly legitimate document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=vocabulary+workshop+level+b+answer+key+pdf+unit+1 PDF link annotation
    • https://travelsafeway.com/userfiles/file/jitopagosinibif.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160909130ae12d---17716654207.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/tusokosaropupogiw.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78529350793.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d0a7c016---kirasilurazaxamaxusuj.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/56109628059.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b9cd572f7b1b8195b3404fdee33e872b/40424887322.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/tukimabobuzur.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/dozebapunebobuvabopaso.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b156c9a3bab---supefumigeboxuxojajasonel.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/nimuxudemebadufobaz.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/95045333334.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/86005145232.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/87869070380.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vatelakogunu.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/15709827261.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/tonoziz.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/femugagoluw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 5600 bytes
SHA-256: 43690a14f806d8311447c1cc5fafac91f81c4854114315d4707bdca1c872dc78
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 1932 bytes
SHA-256: 4aa063a26bd9e70ad0d04acb797bb2078f152c78321be1114478748fdf4fbf58
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 12144 bytes
SHA-256: 9a4b011d5b593e60d45d9ccefb4603f0c9953be79428dfd8ae5072a4f919bfe3
font_03_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71