Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acea5eed8802cd5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 03:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12ee6fdf98bc358f450ac088bb3b3553 SHA-1: 06f12dc00e07bddc26de3e60d6805e6e6f5b291f SHA-256: 3acea5eed8802cd5719a3664935f14edf2a70708c35e494a90ff3a5d58c9aa85
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic specifically points to a social engineering attack designed to trick the user into running a command, likely to download and execute a second-stage payload. The numerous embedded URLs, many hosted on compromised or disposable domains, further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://sinhorelli.com/userfiles/file/pokokefoxejelesaxu.pdf In PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/25089674311.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffebbe449---32547561565.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161337a9980a3c---47841248159.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/81825501995.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nekebizikoduwanatiretulan.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/005287750f926fee723ee07750802653/rikim.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/dudofetoruzudopexed.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/gerolajerimuwuberubuw.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/55274966163.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/90099440102.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zizibelo.pdfIn PDF document text
    • http://mobitransjogja.com/files/kifiwejejawamonadesufad.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614093a08d88c---12447836893.pdfIn PDF document text
    • https://mattress-leader.com/media/pijelurunizatulezojutu.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/lilivupujikij.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/45905174065.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/dosunazamorominiguvoxi.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/dapaguziwusutuxoluki.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/31314237099.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/5557320307.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zedevuvajesun.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jopubutixaxexajalobikosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=revit+not+printing+to+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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 10408 bytes
SHA-256: 61969eac6f0441153b8678260beb20e9566a868e053e8f0f486d732f69eb9daa
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 18420 bytes
SHA-256: b4572d4ec540211361d005305c63abd1707a4893b4e638575c64c1510db5df38

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