Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a20eb625843ce8…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 02:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8052440dae2a6e17bfb6cedbb660303 SHA-1: 9428d08241b36ff1bd598a57321a37d96b2345d8 SHA-256: 53a20eb625843ce8d6eace4a438cc172bab187491956e86c99ffba4607ccf008
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure further indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=o365+interview+questions+and+answers+pdf PDF link annotation
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/siminimipoburuze.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256d1b5895---24577228293.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/40795592070.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac55e355f---voxogugadexew.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/32192161457.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/repuregotakuliga.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/88779950055.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/7935825052.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/jerupisemipitimipigiti.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/69243478310.pdfIn PDF document text
    • http://metapolar.hu/tmp/jamivuzan.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/41973805092.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/dimizegufumuxuwipopama.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/nufadukifene.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/gatinojerisajozur.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/56625262953.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f2b56ac7ea5ac22f40864f385f4279bc/21053724066.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92627663023.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/83049843228.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/ripizerogoxub.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lawivenugavexujopapux.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/vorugesesitexanidojalug.pdfIn PDF document text
    • http://nemalipics.com/faluzadi.pdfIn PDF document text
    • 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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 11340 bytes
SHA-256: 35fbbccd5cd02d757d0a38426f8783e66f664a89853d35502b2f17760e32c19c
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 17592 bytes
SHA-256: 89a9a03bd36f8c3c0b4ae632ecc2e7cc344006b6d6d1c02f4f92d4c34aa85dce

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