Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0712b0d4ace4a1e…

MALICIOUS

PDF

91.4 KB Created: 2021-07-06 21:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58b9c86aba930bf53c0f562ff5141df2 SHA-1: a48332da87cccc24170d287a23370831625c75d2 SHA-256: f0712b0d4ace4a1e280e8eb627c7a37aec980f59c2fb4fb1383efb5100ff4748
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many hosted on compromised WordPress sites, which are likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it serves as a container for these malicious links rather than providing user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bfc040cc9---gozoseziwerodoniseki.pdf In PDF document text
    • http://honda-vo.com/upload/file/69242836125.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/74995935745.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/652b803d16342e7eebd316cdd316851a/64400866086.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944099b0271---demevibusamebefix.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/98664480863.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/76103869635.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e11aeeeeb---61422595051.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d38a9845f---46912138769.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608646df5da91---tivikinijejabujonatiwe.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/11421662305.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kikefanixewev.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/wiselolazefukipuxujunorub.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/37f1b5d07702c0392a52ad0d9d9f9841/famob.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f10a0cf48---3007705071.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/91066795598.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/timiduvub.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/62860600807.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/29947465712.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/12580936200.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/13677339557.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af415a291---68607787465.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/rukosalurusejimanut.pdfIn PDF document text
    • https://drsaman.com/files/95170090123.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e950a96e89fd2c0fb9b3511581a281a4/reresisurobazelap.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/abc278ba464dcf9d698f8b3e4f1e4766/1763237538.pdfIn PDF document text
    • https://2acontractor.it/images/file/74596910110.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d82a8689e---14174738486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=circular+in+cross+sectionPDF 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_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 10356 bytes
SHA-256: edc328b8c9269301e80e9f27e67ffb89753d307cf0d9290eab5cafbb279cc498
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 16932 bytes
SHA-256: f3404cd3187570a251704d881a6f6962b5c52360f474b6cb8c592d0e05982eb7

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