Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa3e09910f20386…

MALICIOUS

PDF

93.5 KB Created: 2021-08-16 05:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e215833b102036f387ce74fffd2422f5 SHA-1: 6e2b6496a560d53d973eb079574e94122f4a861f SHA-256: 3fa3e09910f20386ea22a51e8b965c10aea44621de2d4869721724aacfaa4af3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb1e7dd78---25287468690.pdf In PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/7de1e1e64268047de6fa52957f1fdb67/tawonimalowunomeriwero.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/e507309b4fa4d706c88263d6373acf44/83650643112.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8d7cd7ebeaad809f3836f8b197cb3b0c/72307612954.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/585a6ad7a09fa97621ddc8781f9d79f6/misuwoloni.pdfIn PDF document text
    • http://come2menorca.com/images/file/84627329761.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/85565207726.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedidijuwaziwajejuru.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/fabiwavizidogufix.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c303b8a63---82086421574.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/88686820365.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/dijuwikarerisegemufoxep.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e59380cda96f436c85a0353b63fe64fe/sibasojatevovukojularomi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/satogefodan.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/15662677774.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608698e8e6ec6---47835788962.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/weberovexixiworapid.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/97584449276.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/32876886293.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f3a07d10ddba3e7b2f249f86d7f81b1b/44793473071.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879bd915c7---27083884697.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/sesanikazerizegela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ace+ventura+2+full+movie+download+in+hindiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 6836 bytes
SHA-256: a2ea2f54cc271384552fc24ada2e244faf2d3562b0f08ba838aca1f62367e5c6
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 19440 bytes
SHA-256: 562f8b025558f86656fa5e846186922b641b2cb84962dc2a9e94e78ecebb2ff9
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 10928 bytes
SHA-256: ed019565d103b38ea2a5af4f78036b91ab19908e5c66665bb281b15f0a0210af
font_03_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15044 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd

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