Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa040cd1d3d9886…

MALICIOUS

PDF

86.4 KB Created: 2021-07-15 21:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a37588af6a3e6c45c5eccfcf9e10ce87 SHA-1: 4496f80304c7b6c8ad0e24986f125601b540c835 SHA-256: 7fa040cd1d3d9886cc32cb3bd0cc8436f9b6d6f7fd20b19716356f2df875b633
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of multiple external links to potentially malicious sites is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e7878364b94db82c4379d62758297103/verufuvozima.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607881e8bfcaa---20133274966.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/84504854443.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7fbe26f4b6d5b69f67605446bc93aed6/subopawalisuvekadawowogo.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56247337818.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jb0ldegfkcsvoi2anfauodjm00/tavimek.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/watevubanotazadafadaze.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/91ab88f28330c76b78f3c53a9a29cb48/rirurodumekixej.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93f963523c---76420038732.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9a82ba39a498001fa8addb79f65e97e5/lavaseruriwimanu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/56137947104.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/94590771177.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/74732225702.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3a7105525c578b887308d15a946a55ae/tutejole.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d541034a1a---15241732984.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd83534d199---firidolosubakokalezo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8ebd1fa124ff9d18c0674430b73c5666/21032249986.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ht8dittl7q8e30jj0a4tfovbsp/seweju.pdfIn PDF document text
    • http://rafaelokazakov.com/file/majerobimarugevolijulizi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1f3bf1b193fab2f686ee62d5b3c5a48b/rulopisirisumikuwakinu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094977c9323c---41061508303.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2aa0920fd---27284819521.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/nukanadisukofaxanobabora.pdfIn PDF document text
    • https://chp-travel.ir/data/file/88578311124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=worse+in+swahiliPDF 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_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 14820 bytes
SHA-256: 7c2c649f5a493cc7bd2a4f189103ad361b4d6025fd74aa920fc39f6bac2f5c1a
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 10184 bytes
SHA-256: 2664fcb645aa09342a3125a9893b8489e84d600b68ad3cc43e045bae4846b8d8
font_02_sfnt_off000134a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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