Malicious PDF — malware analysis report

Static analysis result for SHA-256 b182563c583ed95c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 14:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f86b350b7fdf88dc14d02a3327609550 SHA-1: 6dcfa42f18532bd5a049105270ff832a2555bda6 SHA-256: b182563c583ed95c05746856b00a4553b65700acbf2b1e36a4875d727712b3f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The PDF structure and the presence of multiple external URIs suggest an attempt to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://motelandratecuci.ro/userfiles/file/33195084979.pdf In PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/jotoxinetuporewalokovuxo.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/lopekiwisitawazoxuxev.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/35006917688.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9ge2gsvirsg6g00nsqnq2mo7tn/zigadezapolivuwopofi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/45763430284.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/16478059815.pdfIn PDF document text
    • https://phukienbep.net/media/files/96826151464.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080200bd71e1---jatedopalaranoviwu.pdfIn PDF document text
    • http://yanartextil.com/firma/files/52292620542.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xiwafega.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/80096190438.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xuxem.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/77863431315.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba18b6438f0---18337986017.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b4a112b9cbc19b6b427fda647e2a4ef/3866342496.pdfIn PDF document text
    • http://tochuchoinghi.org/files/rasuxanasilizolajogizuj.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///64595951467.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/j3urjn6qpqpfn5fl9cdu1n2t46/gorojoxejukoxafesu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e10e20d2f50---42859256407.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/a667ee96093e2db0be6366a475b410b5/49383729535.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/wojisunupazulefat.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f3be1e505aede78a87ee7c31f0020972/zifabamilusaju.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca9a3fd34---wesuzonajakajupetanika.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/kivuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=math+worksheets+grade+7+equationsPDF 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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 16708 bytes
SHA-256: 98b368a10115ada443e79aa863855e949331cfcf5903c24d7c89d044eea102b5
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10948 bytes
SHA-256: 25e2c9987d341e0f3ca6ccb2173d9efbe794f42709bb0a9489e4a8a6f782a673
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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