Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eae21068af3d14…

MALICIOUS

PDF

103.7 KB Created: 2021-09-05 04:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbfae387652ea2614933056173d768d8 SHA-1: aa9bccdfdb110de4fd1c79e6d50b4a4a2cf91fbe SHA-256: 21eae21068af3d14b7bab941433a4dd30a103bb27d7d179394d28b46daabb65d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to direct users to malicious content. While no scripts were extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/flf5ajgkqgk1an5hmenrs97ng2/47593650659.pdf In PDF document text
    • http://fw-simple.com/uploads/files/begiwimigozutudojas.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/76719600349.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/6827061800.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/migepisig.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/2973761992.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3c39c2354013d3d24e537eb04c0140b0/81006282359.pdfIn PDF document text
    • https://ikima.fr/uploads/file/43198454627.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///rulamexejakulidukugekowuv.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/35253489e78f81fcc48f1833074e148e/wakijafe.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076a307cb6a5---tomufeluletuganuzujirur.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/12163531320.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/28319236683.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/galumexibedakavonari.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/fiwozebuwuk.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/47943496174.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/guzude.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/50249121121.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c319d427220---juwuteju.pdfIn PDF document text
    • https://zzhqhi.com/d/files/3563196284.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/gutivenutifiwazarigobojel.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4fcbc142c828147acaf7f386074b7a64/51481168928.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210902185501_412851214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=r%C3%A9solution+d%27%C3%A9quation+de+degr%C3%A9+3+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 11324 bytes
SHA-256: 11ea7e3ef2032e4a1a6b23b0c7ab2b524edfd8510b396bfd55d000118c66915c
font_02_sfnt_off000155da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DA 22044 bytes
SHA-256: 44d12c3811f622734e18add660fddd8c2aa3b801612d9d8e25f4b26a7f3aefd4