Malicious PDF — malware analysis report

Static analysis result for SHA-256 32426c311f67f618…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 03:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7211ebdf8979ee163cbd29643e61877c SHA-1: 6276b7c4188c87c74ba7a007cb956be0231022e8 SHA-256: 32426c311f67f6181c155afd28853eb4d17e2a225b26624350cd08bff038cb2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/nilumokimanerevipis.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f760c286c4---78626481293.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/zoxiramuwul.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/97447300651.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xabulibozofep.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/05aa648385a094dea6178606c4c4f8d8/siwagotajubivupekil.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c54375ccd9f10da7cbdcbda2b011a95b/letise.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/rabivawosoxusexo.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/30848111265.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/livanaj.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dowuwinorupajigazalaf.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/lisejezisowazunupit.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/sojajawifosolufoxobawov.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/76n0r6fia1up15jik10jm02obj/jofelikosiguki.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/47bf0571fd538c91aecd63651324087d/99229924454.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/lupuxudupobejebigafedi.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05fc7ee983---tekumisowodafasufi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/47194d3a0b5411fc64a64e83d15b8692/tiwevaresu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/wofegutojiz.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/56987234748.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/0fs06lgl5e57ume17rot2pdodf/rulokawawijoromos.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/28658907855.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///33025336262.pdfIn PDF document text
    • http://pk.mo/userfiles/file/83478369162.pdfIn PDF document text
    • http://sparkpro.lv/content/file/38627556880.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6b48cf1a---51940658741.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/66551166336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=thich+nhat+hanh+biography+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_off0000c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC159 18156 bytes
SHA-256: 1f1f586af17311d13e2617211e0c4b19d5c187f5e6a8b3e4b38024fd420f109a
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10768 bytes
SHA-256: 0ca93e512858da6d0b9485e93102e523dfc80be78935f1ee0a95f4985e5018a5
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1