Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84ff2e4b4aca35b…

MALICIOUS

PDF

82.3 KB Created: 2021-10-08 20:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 063c642e073725e287df7f410861e3e9 SHA-1: 6155f613362434baacbe73e0b4cc036270554950 SHA-256: b84ff2e4b4aca35be0c412cb62ac2652fa8a7b9e5587a1cf5bec8f56cfcfff4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=horizontal+axis+and+vertical+axis+are+the+types+of PDF link annotation
    • http://s4l.vn/storage/ckfinder/files/55912647892.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/93123513573.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/rapivalumexufigexam.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/vovuzuzubutumodoxu.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/jiwuvupojuwisorixona.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/72826730364.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210914_140443.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/xuregimalopen.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/vawisu.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/vogipebodep.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4538389e5---51483520103.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d72ca173---2214899345.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/vuxidamuxugugapoka.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16154066401aa4---65742888968.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148701013426---67662680636.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/dobevimudasevutij.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/33477804817.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/dunobevedojo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9fa6a674eee89c22590e50cb78b2d958/10658298629.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/sosejuri.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/juraxevi.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/34099150855.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/68751308091.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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 11048 bytes
SHA-256: 7304d9c8c2d8056beea55e95bbe609e1d7225f44bf2b72e4244e4d16ace9bf68
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 18792 bytes
SHA-256: 6121d26799a7e01194c6121f2b3ffc2c8062734016c8584eba2ebcbcf631f5c4
font_02_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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