Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb1f204a0825b52…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 04:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1e56cf75e5344c27ab7ddb26429ba26 SHA-1: ce0c3cc3a50e900cc2b1458d4eeb5baeb43e4c74 SHA-256: 0bb1f204a0825b529bf787356b3597ea1bce6d4f293c08aedfb8e6888d313cc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links to external websites, many hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/sneq4mkkvekdgp27pqvuth2hq7/53203769497.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b1b44a7a3108e533739c33952a6d00f/15693467500.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/239adc5154056ecb147df011d7252f32/33952080406.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/pipizozugune.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/15682521354.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/53248692769.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/58859609198.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/48974619736.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8d906a8f---69629473915.pdfIn PDF document text
    • http://licausi.it/userfiles/files/9909688536.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b9260d63---43194210348.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/gigiviwiwivuze.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/90491544419.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/rukuworigepopijiziz.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/junujuvi.pdfIn PDF document text
    • http://status.cz/UserFiles/File/juxalex.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sebenamujinerikeru.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/eh2od0dog7r3jk28h51n6r76lo/xejaxisepavi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/69f3f78a70b65072dcfe60bb7f873cc8/jokavomekixav.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mijox.pdfIn PDF document text
    • https://aksusu.com/upload/files/14279170251.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e03ab5b3f---lifela.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/lebopibujitixules.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/91220330833.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a4509ab68---63498506288.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d89579f3836ccebb0699a1376ddd5e16/80216398048.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df16190735d---dulijulavikijowepas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=basics+of+sending+and+receiving+emailPDF 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_off0000c2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CB 10840 bytes
SHA-256: 27abbff97f3902cc4d15803389d5cdf512a285ab51ca94429b9056f7d30f0094
font_01_sfnt_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 15788 bytes
SHA-256: a27e9c5d13d4fdfd3465916c8bf9afc99fca815b25643d379e6f433f8fbce149

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