Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc4c3762150138d…

MALICIOUS

PDF

183.7 KB Created: 2021-06-28 12:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dda52acf84b4a1a21708599a4ec5a4ad SHA-1: 8b8f7330307324e1539350c11b1f1e10efa7706c SHA-256: 3dc4c3762150138d6d49ad494edbbb8f5651930a5fde4ec87d39b984d2d7df40
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and the malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://cakesandcupcakes.net/userfiles/files/wafulamobimusukum.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c22982a6d2c0ff42c3fc5a57d5559dac/vasulabisozebesuwosor.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d29d916f978---minixejezesakigoxiroxo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/mumorefuzajodeveg.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed68639e0---sosorejitexe.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/16657131626.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e1113b429---74824171355.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/712b86ffe12373e290febe47f5f01ea9/2285034865.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231bb7464f---nezexisapu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14011619766.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/57ebf6b582fbd900ea29db0dd94849bd/51147594639.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc2fb31cf---bejapobipiwa.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/dd8213b8740ae7f81428efd739a305a0/lizotagukewopewo.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/95942675478.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba83fce115---28733110323.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/nijudasinojemo.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7e768e97fce155ac7388b3e8d9e62b28/52916735589.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f47b1235---pakejitazunisasizigox.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f45c318a---78329332931.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ad9672e202771684bcda4d99ab1894a5/13632371249.pdfIn PDF document text
    • http://ciskmv.com/css/file/suxuromujoruk.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/simujovewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ford+mustang+13+reasons+whyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000253a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253A1 11056 bytes
SHA-256: 5d4306bdc51fbfc62a2f56f34ca19f2c1be9771caba300c4de2810eb6e75e442
font_01_sfnt_off00026d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002853b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2853B 18072 bytes
SHA-256: 7952944549dc690b32c06f03060b4c54d19da077f0010b472d807e91e9c4c083
font_03_sfnt_off0002a1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1BD 17936 bytes
SHA-256: 0916ceb53d6a30d1a9cff4311a554c278a194986aff0d4d3f63a4add2ae50d66

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