Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bb3e90385d9551…

MALICIOUS

PDF

107.4 KB Created: 2021-09-08 07:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffe2604aed6c50cefaf566d92021d23d SHA-1: 2f4f6e1daafcdfa87d0f7192c74bfa958028c643 SHA-256: f0bb3e90385d9551f056e487fd581efcf1221ee25a72a598e5385c04d5ff2a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://oniceh.ru/uplcv?utm_term=implicature+in+pragmatics+pdf PDF link annotation
    • https://cape-electronics.com/media/file/vutujer.pdfIn PDF document text
    • https://jin-ji.com/upload/files/51692445942.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/xunodoxalogavi.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/peusb6va331tg1uo5j2vmhafeo/toditunaseripoxazamu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/4013248544.pdfIn PDF document text
    • http://matras-devison.com/upload/file/nezudoruz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2eeb3342636d0927c495c86d15a19a49/40562534608.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/xukirorefokegukimo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210814_5308E8E7F48F8E52.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac6a4efa5---63278087695.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfcb99ca3---80366019754.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xuxunokedodevi.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/916535acb5ee38801398508ba5223017/15630254398.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ce26aec7a4cd6a333f7368e35efc8e82/92157959233.pdfIn PDF document text
    • https://dintek.eu/uploads/file/64387709947.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/56240980761.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/nugavilaxojirakodeba.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tuijk7e8812stpbta4od0cfuhf/87885361546.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fdd89b4c---deviku.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/40160561928.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/beluxumo.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rerobegotadokabipojob.pdfIn PDF document text
    • https://wrd13.com/force/file/11543263702.pdfIn PDF document text
    • http://kfbi.ru/content/file/fifiwepubunaruli.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fca67339f3b---92975460376.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/zisuwazogazimazume.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_off00013a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001528b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 19852 bytes
SHA-256: c90c35efb2a92ab44724753c73e90da6d761b661a25a608a1419c2194c942d05
font_02_sfnt_off00018627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18627 10896 bytes
SHA-256: b81c79fd615168a02add6629cedee9ccdc4e94d211a8a10ad308d05495a39a67