Malicious PDF — malware analysis report

Static analysis result for SHA-256 a648671e3d4a205b…

MALICIOUS

PDF

96.9 KB Created: 2021-09-02 05:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2183e6a267b70fb43df123c061ea099a SHA-1: 7b05645992ad6669e8d6b42a976932ebd7f3a517 SHA-256: a648671e3d4a205b6b37fd3ce5d9f12aefb00755bfd75734c431bf5321e828dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to download and execute additional malicious content. The heuristics indicate the PDF acts as a link farm, pointing to numerous URLs hosted on compromised websites, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3eb46cc0e77f242b1487921ed086f78d/64315834813.pdf In PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/karab.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ab94453b---puwidotivunaduwikomolez.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/25ed710901371219fa41744b648cf3f9/gofugadan.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/89773522384.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/63930112478.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/m44j3hco2arb7vqope94o414cp/tabebinololasukobo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6c8c04f5d---bamolodow.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/93528262969.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/guwelokojog.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/56947493255.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607730390a1cb---67027639895.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/578ccd80b5dc9961901815fb5d32566e/46740152515.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/eb018315fbfdddb7426dcc80fb6ddee4/17119689884.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902070424688.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jagorotarujosudagig.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6a8b5a66---10609188919.pdfIn PDF document text
    • https://webmenuplus.com/images/file/dusurewezezoxef.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ede9c7c5---23219105260.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/92763494452.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/ruwemenoge.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/76123013439.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/32892608904.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/meweki.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081164fe7f26---15614423185.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2df3775b92e10550b9a35aa36d0c5bf3/95274996721.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/13743396027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+book+of+broken+hearts+pdf+downloadPDF 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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 22520 bytes
SHA-256: 10a5ba6827943bab274c180b4c9c0597722ddfdbffc4e7ab41989450598cba32
font_01_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A9 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_03_sfnt_off00015a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A53 10784 bytes
SHA-256: 6838a2deaea5367e9dbb58c082d835f3c08768defd8b5b900bd93c252074db68

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