Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed49b1ce72888f22…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 23:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4263d4b9634b349f51b9f8e2480cb45 SHA-1: 692a081543088e131db5325b2d6e6781cfe74486 SHA-256: ed49b1ce72888f2229286c49dbb39adf8006ac4c2675f156a32005a5213b46fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to various domains, suggesting an attempt to distribute or redirect to malicious content. The presence of PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hzzxtl.com/UploadFile/file/20210819142420151.pdf In PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/lafutanodesera.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/95334459060cfefd033265.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/18359578873.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/16912329715.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/kegolujasojufufekoxi.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/puwatuke.pdfIn PDF document text
    • https://ivanamihic.com//files/wowiwetamojapusuje.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a85cc2a8e33---18087771004.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/tikipobawutemile.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ffa7516c---fetopetubix.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3a4ea36d359141f79d06e867b4f3ed2f/xavedo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cda52d640---napinesolalur.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d942c227e0---66915990056.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ceb4a0dc0---fanoxaripid.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/rebododilokebaxobavijirur.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7a9114a951c962e01770bd5cb45ee65d/repufeporarewepubimebagid.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/d5f47la3qm2mcpgrvammpm4n0s/43198464481.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/zasobajaluzosemugufuwebe.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/61644730314.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/bazusubon.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/kunuminudubaxonirevewow.pdfIn PDF document text
    • http://serting.eu/userfiles/files/41725737209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=%D1%80%D1%83%D1%81%D1%81%D0%BA%D0%B8%D0%B9+%D1%8F%D0%B7%D1%8B%D0%BA+%D0%B4%D0%BB%D1%8F+%D0%BD%D0%B0%D1%87%D0%B8%D0%BD%D0%B0%D1%8E%D1%89%D0%B8%D1%85+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 16856 bytes
SHA-256: 771bfd87f3314945a7c9f3f27834910b936376c246c40cc780251accc632b541
font_01_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 11408 bytes
SHA-256: a4113b15bdc37d24e019b99f6692be0e95052b91cd2a7a7e18286dac7f3d091c
font_02_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 28440 bytes
SHA-256: ba6784ef43dbb232cdbc6a9641ddc9433160cd6c5e9c927b0a98973bf8952f7a

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