Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27d86b6e354d1c8…

MALICIOUS

PDF

81.6 KB Created: 2021-06-30 08:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad3a8a7529b14cf1f53ca419da0e2f26 SHA-1: 2673f5e8f7927f0190a6a94040a7fd2fcdd42f73 SHA-256: d27d86b6e354d1c880ce0cbd792daef52d05a8940e1dfa52c73bd87bef67de97
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to manipulate search engine rankings or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://n-v-v.dk/userfiles/file/78356070938.pdf
    • http://artdealer.vn/upload/fckimagesfile/41dcd2c34006fc96fe4550e60a7fe823.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c5c156df802e68f656cee91a8c47e408/refajanevadenu.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783fbacf800---fetenoziwak.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d9bda34f47c647dfd636485b5a83f62b/kosexazimavuj.pdf
    • http://tencanpowder.com/d/files/87990253554.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/49ldme0pa48mts25hnhgpn5686/wixelagasisiwigukefatuwer.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7810b2e71---47636572625.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c176f73f4d94c2dfe22f8cdb5b9f3975/gixuge.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777508602ae---63492198087.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e2498c8ea2e70945f97b15591e50a21c/55809091688.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/av06rv0iva2t2jprt67e30b0f4/58357116225.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1608755c---24154228071.pdf
    • http://55thocscompany.com/clients/62662/File/mavawofopakumadokubutujof.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3c423d8f6---18888852012.pdf
    • https://euro-commerce.bg/files/51563428412.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ac697ekenlae2i09n3gksam7c4/gixuzifaketaratirupalales.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/buwofamosapezajomole.pdf
    • http://wagnerpc.com/userfiles/files/73790248615.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8aad271ac---mefuvinomu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c647925a7---gakegokusivezewepabanup.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8f7fd69c23c50ba0e84a5b6ff88bb865/wigufijuvadulefowe.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081028b3d342---33684885499.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f5924e16cfde34062df42bbac1ff62d4/54464519623.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=online+marketing+and+seo+services
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfc.bin
675ebfd766b43bf41de34f591775dd674ac665d85f131434d637d61c57f71069		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 10896 bytes
font_01_sfnt_off0000f606.bin
a192cf84f90a8370177b1046728bbb1a7feff09551ad407d0beed77fc74c771d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 16608 bytes
font_02_sfnt_off00012138.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.