Malicious PDF — malware analysis report

Static analysis result for SHA-256 f578b8812794a520…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 15:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 705a9504fd2fb3dbee496de971381e26 SHA-1: fd457fbfa364613ad5ab20d5f268669d3c1adb2d SHA-256: f578b8812794a5204fb6c12cddf124d90156f32d993c3df426dce5cf14d30d2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or falling victim to a phishing attack by disguising malicious links as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hongmao.tw/uploads/files/202108311856259324.pdf In PDF document text
    • http://ducthanggroup.com/webroot/img/files/21597068360.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/86437015249.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a28694ee---83601397685.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/samasak.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/jomegasoxufoxologunugeti.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/93419004916.pdfIn PDF document text
    • http://allycatering.com/userfiles/moxes.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9bd6346c---72076574360.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/2202946557.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/71601494493.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161381d0e91612---gubojujifa.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090515244419.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/difikevuwarizebejuvil.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/gavisigojexoviz.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/pomakexozosu.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/68889164386.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/22426149268.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/zepetimarinawomasovege.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/lotadaruwizisevomabozed.pdfIn PDF document text
    • http://thegioioto.store/upload/files/84402103264.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/03/dutupedekebe.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d8a7cb74---kudaxufipisutosobotomak.pdfIn PDF document text
    • http://atrsara.ir/resource/files/jizutorepenib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+face+up+download+free+androidPDF 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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 10728 bytes
SHA-256: 6460efbb1f2a55131096b8b3e14d541e75b3bac53d07484f7c46e278246954ce
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 17172 bytes
SHA-256: 8a222c12cbd5a1d840f4aa9133eb1304e9c2f1a01b1abcbb3e90f262a6f70a62

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