Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6481efc602590b5…

MALICIOUS

PDF

82.3 KB Created: 2021-08-02 20:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d56bddcd984f25f84cc134082f80744d SHA-1: 967955314d28f1891d76b94e1559325ec4d5a70d SHA-256: b6481efc602590b5d5aad6641bd8d51cbc55fd5be8c26c8c0cf6a2a18b7dae49
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://gift-founder.com/archive/upload/files/dodeludupasaxefa.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe705b38f---73430281453.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c66e0d2163a---34030378952.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/63739519835.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/13250563931.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/10133166602.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16075defbea905---lupakukinijopufitasagam.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/rozekofovebigofe.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5hbkl3cncu4gf7ojva0njl4sni/14683339139.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p9ie1r9u9slqkp57g5sjknartp/tomiluvuzeve.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/pi3l9lss6rjsrmob85dp07fv9q/34322526640.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1a69ec2fa24f8f50e6c6502269baf426/zifutugerapavogufekamuj.pdfIn PDF document text
    • http://robedecreateur.com/img/files/88958619428.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f9467e45---dubeg.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/xorodireginadimos.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/setijukonudakonodixuniz.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/53283963325.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc2c49a83---54473723768.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/dumisugurawebuwiw.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/20525360649.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/fogadifanafazezap.pdfIn PDF document text
    • http://bjjiffy.com/upload/5464981685.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d74132ea---48433818051.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/kolufudemawod.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nibirurulit.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8ar8h1dqg3ap2c4nm15h2saik9/97292038009.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b651bd78---21530358503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=progressive+verb+tenses+4th+gradePDF 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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10764 bytes
SHA-256: 5d8de4f8c736d483ea3b880fbb8730c0599a9c52f8323d7edc1cfd7edf1414e2
font_02_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 16640 bytes
SHA-256: 4379a9f023bd57acd4fca9c6e79b203d2ec1410603f666f5a7e1982c6dd8e406