Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d8ae4b0337c10c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 21:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c42a3bfcff5286ccd7b3522db0cd31c SHA-1: 0695564fbcc03dd173a8b62816336a5659d19559 SHA-256: 65d8ae4b0337c10c824d993fc387abd17bfbb3adfda6046a0716ce57798a7f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other potentially disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hhe0hk2ldvc8nluat32pmpfnuv/82424820688.pdf In PDF document text
    • http://ankamet.com/userfiles/file/mutosug.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b2e82f4b---19027417694.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/11788945722.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/11488115253.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/kovixoz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e31204d70---sovuwovorozemetuz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e6a4273e---87894691122.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2275ea950---4850161534.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c00de23130dd471cf56e6665860875ea/21302272810.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/57937578795.pdfIn PDF document text
    • http://iviltra.lt/images/files/75253921179.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d9cccd60---rizawaj.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/gutoxixedog.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/32651894906.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/53510800402.pdfIn PDF document text
    • http://poorclarescork.ie/images/80118654292.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/20288025940.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119abcfc1a4f---ziwumadudodoluvuran.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/6105320772.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/padodemur.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f7b3e143---fifirupuguto.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/pomomubivaxekatudagikux.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/difajur.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/46050591211.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rk9dp9gs3aum91qnthomlnjbn2/supon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=uv-1900+uv-vis+spectrophotometer+pdfPDF 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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 11120 bytes
SHA-256: 670596b04bdb4666c2ea1b79e211c5c25540df1ca96c5b8bef2c08068a5687f2
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 18320 bytes
SHA-256: 5c7745588e9b58cbe4a029d87ce9c0b2a2c763a5f6c08d41c3cf687767bf8c32
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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