Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f766cedde5f3fa…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 08:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9837bab0fdafd59ca411e6bde2a5dee SHA-1: 001ff355159e51190d31c29902da84317db83001 SHA-256: e9f766cedde5f3fac8d9124741624d3b230dcab7b7f1167c576771ac28b306a4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This pattern is commonly used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://queure.ru/uplcv?utm_term=being+better+humans+quotes PDF link annotation
    • http://aivieksteslaivas.lv/userfiles/file/lirufinaxareb.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/28095984395.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/470e2eb3c9f6bf4be5c95718047056f8/81532459917.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2nqdc42g6plmiuebasg2v164m7/givatorawiguduradokobi.pdfIn PDF document text
    • http://dgjst.com/upfile/file/16973706313.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/joxuxawedaru.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5397a9ba44---13649576598.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/67753667516.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/lurovemazuk.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74403442540.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d5156f02---24887400945.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f15779198---savemowiwa.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/movikimikuzoriburis.pdfIn PDF document text
    • http://chinazzjx.com/d/files/18475534340.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/77738213820.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/ratofamexef.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/93073657195.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d203c74c29---mokijudazowefatap.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160acd06c71540---woguburuzuwojot.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243ede941f---30720391366.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077144b22c81---31167813614.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e384c99642f---38106437234.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/xinex.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_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 16912 bytes
SHA-256: d7e97766890640610a446d86d82e6885304c3e69459e7609391791f857574e4a
font_02_sfnt_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 10948 bytes
SHA-256: eafb75542d4332e27b3dfa09237c9561d8c17b7575b239e3711f61eb407fe667

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