Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb164e3aaed97eb5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-11 16:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cd0569b8a8926f76195962b2753d1c1 SHA-1: 70612247ded182577e169ff64d62217bd9a9f776 SHA-256: eb164e3aaed97eb58fc5dc598804a8f9568b6bb028019f95ff75fc71901abb83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=given+manga+pdf PDF link annotation
    • http://compsult.net/userfiles/file/korogolegavodugoxisonirap.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109100942185006.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/35148093756.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/17230677379.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a658e7dc5f---76934150971.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/75897244626.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/99805851572.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/17253864878.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/47631838593.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/nanugegup.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dewugux.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba1c9be7---39722026687.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/51466155375.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///zoxilomisilokebi.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/lutuge.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/8360443602.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nazutiveburunujumurumoxir.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1f7cb297df5e47b7aa4e2e972cdc3e93/jaxukukibakijogukiniwik.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/84746933048.pdfIn PDF document text
    • http://sbairs.com/datas/files/duwikodepobomovu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210908/210908155109213921zo2sl1fxfhgb.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/xuxulosuxaxuzirefexojeg.pdfIn PDF document text
    • http://special-pharma.com/upload/files/30594170921.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a985470672dfedf8444121ee7854d12d/73538646515.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 10412 bytes
SHA-256: 82bae06c73a70047e545114901594b6badfd6f94692239f3123a44f8369f00b4
font_01_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 16380 bytes
SHA-256: 848385bda8fbfa417f457648f4719723a22ea52fa0c35cd83fe75662d5f2fdb2
font_03_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 23144 bytes
SHA-256: 576852c2973fa2c3cfe9c50eb760cbc03d0eb05e035099900cc04da771483dac

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