Malicious PDF — malware analysis report

Static analysis result for SHA-256 717134f5d291ee5e…

MALICIOUS

PDF

90.0 KB Created: 2021-09-01 13:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a2667a199a6e9404d656619b41eb53d SHA-1: b3ac874b1e199312b2c9ac6b8fdbc246f99d5347 SHA-256: 717134f5d291ee5eb6edf3210f5ba808329a3ddd94743ccd3c8c558201af7430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://allytemp.ru/uplcv?utm_term=best+self+thoughts PDF link annotation
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/c3b1h3pm4g47dop6h32cf6o0k5/16986297667.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/52219243268.pdfIn PDF document text
    • http://holzbau-napetschnig.at/jamudaki.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/pabixojadifobogubuvi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b29497340---46153962745.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/lapasur.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/1197709843.pdfIn PDF document text
    • https://soechi.com/userfiles/file/kutigunojiletaduxit.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lufizosirukafonafabigaw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/55265143217.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef0840579---pasenupeboratoragad.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mctf83nncaoiaf07b0996ko8m0/sefus.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f13c3871ad1b8797576a78d1131846a8/22761125011.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ddd02278---6069350433.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610542cbc882a---8563960390.pdfIn PDF document text
    • https://producto.works/userfiles/file/836176366.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e836ad9531---gabilugavuna.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i4qqqmdmuifq6kt11sopufofk3/lefasedolifemuju.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/xediberukofowuzof.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/bixugogetifef.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050506112831.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/gubatikowedupotipoderibe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e80226619---18199297566.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/gudujijo.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/65230830664.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/52347645458.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afed6afc71---22326792988.pdfIn 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://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_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 19232 bytes
SHA-256: bac45cd0b771936c00e6a67732efea6f971936e3a94e6eaddf6db742b82e1233
font_01_sfnt_off00012a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 10188 bytes
SHA-256: 439987033abdcc826b18c0e00c1fa35665757378e01cf32e7256ce56b1c8b39a
font_02_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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