Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9df3fc00de4843a…

MALICIOUS

PDF

85.9 KB Created: 2021-07-22 19:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c802d6ebbd8eaccb1df1400a25e32a9a SHA-1: aa2137fe91b23a8143a22f505d337b91133a7162 SHA-256: b9df3fc00de4843a1901916a672889f46ffb7065f9d045d7a535031e30874d34
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. These URLs are likely used to distribute further malicious content or for SEO spam. The ML classifier strongly indicates maliciousness, and the heuristic firings support the link farm and compromised CMS upload link findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://splogservice.ru/content/file/sujupugire.pdf In PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160838eb36ed14---xoxebobewelevuwor.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/p0bjr2ft97durgrbfirj6fttj4/tixezud.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398d97e930---66762191563.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n1h1kpcralijjttf075onouvq3/92204854247.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f52c92236---63379204645.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8c721b234d51d99be47ee9a4d64395a6/sizoleselunekujumisiv.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/33819685132.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2021e45a74eb92e6793fd37abc1a3700/fawikiwufotelagumaruwuwu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c41a64908e63f23b99c403e553ced16f/88020460920.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c049d5ae799---52195772193.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b808bfbd6b56f8d6771c44b75a5b5713/74857901109.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/69896694429.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab089a5b6dc---93077237653.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/152a5a2201a7e1c4c8eef722fbbe2492/50623994630.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/1323071436.pdfIn PDF document text
    • http://kasargod.net/uploads/file/50431213698.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/75108852009.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/wasadedodedomazepumuxe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4569d2f5---kidosomalirimuvipoxivelim.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/79598673980.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160745db324d87---lalapejepado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=electric+and+diesel+carsPDF 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_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10224 bytes
SHA-256: 64076f9d53dad6c49424faf094eac4616af3d8d113309eb31d83ef436e09b2cf
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 17184 bytes
SHA-256: 254e9fa62812d329465e34728ca5206c9cb2fa08842baadc1f9a58a55704552f

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