Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d266785fa012a0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 03:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2da2553e371dbe9f3f4ca389c8049b35 SHA-1: cd094838b20cc8aefa194b25275a3dccd162e34d SHA-256: 71d266785fa012a0f1c2d1f96c1ccd50ce7d6454217cf1e7f4f8bccfa2705c26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://plagij.at/ckfinder/userfiles/files/4107020699.pdf In PDF document text
    • https://fratellifurloni.it/file/70927769292.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a4e0f755586926ed559aa14c91140e6c/35913847640.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/4ead49778d85a5ecc368ca23ce1288b9/resodapa.pdfIn PDF document text
    • http://waterreducer.cn/d/files/bakefikunikewubikiz.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf28a97ac---vudogexijijubalebafetasax.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/48265609841.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/94154062914.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c524aa48401---92597604850.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/wokejavuvabegemibu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0e7cac140381242b2da49dbb25204990/71776758455.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fa07369c5dee35ee8ae8fe572ffc2f09/xitawurunifafotijidiwisul.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621843237.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/udoaroe1sshl71mqsnrak2oo36/59326173484.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bo16dp98va3q1i03k4lvfbdc9e/39880412919.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bb7bfae8---89252569775.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/nolinevoraporojebasuko.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612d696e2655e---sepufasovowafubi.pdfIn PDF document text
    • https://activepymes.com/pub/file/5733077422.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/21810211583.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/67192039172.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/50213347103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wizard+of+oz+off+to+see+the+wizardPDF 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_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 17308 bytes
SHA-256: 4b28ced1092d5a9a0d1a2f1a4975fe231a2314db44271572f9245ab91ec83500
font_01_sfnt_off00011455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 10440 bytes
SHA-256: 249edbd0fc665814138ace3c58913308025460f59a75ec52d9668b05ecfcea19
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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