Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5a3b749cbc059f…

MALICIOUS

PDF

90.1 KB Created: 2021-08-07 11:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abbbb382cd049fc16aa060d70c75a47d SHA-1: 0bafdb8dfe7efc279c86676237a8780bc809a3d4 SHA-256: 8b5a3b749cbc059feff4913ef45906d1c1f76bff7014abe99f44edd81b8a8018
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or spam campaign. The presence of these links indicates an attempt to redirect users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=how+to+hack+netspend+card PDF link annotation
    • https://smartech.lv/sites/smartech/uploads/documents/files/97237136537.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/626894e242e3d82772edb11c49606958/wiwiza.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ribakuxop.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3emotk6oqklh7bov6lke606r40/95560479328.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2f5bc641---suwafonizanifeti.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/duduluwepefobiliviroz.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb557e59a98---rafobinizonege.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1hvpsatv1taf74kncg46d0v8o/vunixurodupuzozofaset.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/73666450540.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/63541297634.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/mokegaxoralasopa.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/bijikojediduwakokunal.pdfIn PDF document text
    • https://careeraccelerators.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc82eb67be---45958561077.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/zodogafe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e138d3b3d---54924939576.pdfPDF link annotation
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081eed01c4d5---varezi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc91d95c9---vutuxifowomaga.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/8410144666.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160965a67ad77a---dijumofitezikudawe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bea5289a704---26564678429.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/ralulovutakit.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0079980be886df1a62dbab868d31614a/65151602726.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_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 17748 bytes
SHA-256: e49c383c993b29d516238c7c0c3a716ae32f28b65f00ca12919463a497574a9f
font_01_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 10644 bytes
SHA-256: b089123cced9fd0247cb9f375461970ca7728d7bb2df65fbf196839842ba3aa5

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