Malicious PDF — malware analysis report

Static analysis result for SHA-256 752842c83cfaf129…

MALICIOUS

PDF

94.9 KB Created: 2021-08-10 23:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f5b28009a86a069408a5bf49cf31222 SHA-1: 75d0dc22d45ceb3b751206fa077bd969a0dae0ce SHA-256: 752842c83cfaf129ab1f435983528840a0eaf7daf30ac326368460045bf3919d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are designed to lure users into clicking on potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160efea05b11ed---zibuvazejajuxikisojuvedi.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a882ab218aa---35702863938.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/wetesinago.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/ruzapedasififaworemuw.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/zenijesoz.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/53333275846.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xukax.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4643838569524589365a284f4d2383ae/mebexilofudet.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/dowusonubuse.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd4b2c9258---pobobunegiparutise.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/wugawu.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/83068111976.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/lixab.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc47e2e6b0c---16056978322.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a8e582b4---tipolivubebopuxam.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dogakasavuki.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b45706be473---51703513337.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/guxipopifutalemo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da2e234c3751a6cd64eb2e8e8c2fe414/2041069493.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc9475284db24f28cef91f62fbf34bfa/dafojed.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbf490e8f---loguwoguniwapakodalop.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b8c12f2d---33948832511.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/sopez.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/kapefakudavokekaxixakoruk.pdfIn PDF document text
    • http://goref.ru/files/file/63799050813.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a7bf23022e5a514ec6e11e21c2a05056/33701215674.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0cad5d07---gefig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=is+total+war+pre+workout+bannedPDF 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_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 18404 bytes
SHA-256: f90cc516baccf2809011f7c99640ccea9d973d9b6bd3e875521340c8e4dadb27
font_01_sfnt_off00013ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 10660 bytes
SHA-256: 1c8e456bdf52057c54f1e3b4160d9b55b74c6fa723ef9122304727f1c3774c56
font_02_sfnt_off0001534f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1