Malicious PDF — malware analysis report

Static analysis result for SHA-256 68216fedc80e5a4f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-04 23:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b15cff5b775d5d06791cd2f611b89b72 SHA-1: 9fd1805402912bda7419adb374a1f9efce6812c9 SHA-256: 68216fedc80e5a4f853a4a21d73ce67f2aed917699108d352faba6e74600c602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://albawadiroad.com/userfiles/files/90260710071.pdf In PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/baxofevodufuroxiz.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/jirotepegiliseroz.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210901154445.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-14-02-32-37-JqGalQr1.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210817193340.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/16328736653.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4c04fed3---80819702368.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4ac661b---84488454040.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/21740996087.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/32989540175.pdfIn PDF document text
    • https://moolans.com/uploads/files/judulekodipid.pdfIn PDF document text
    • http://raczcsalad.hu/files/29241199850.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/885e667a0ce2f9a5d756ebd9667ac293/45570805344.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lizojaxubawakaj.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wanafoguromurelaluba.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d9ec8521---47759718169.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832f5a662df---84382909886.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/rexoli.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/54254797425.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k5mlctvhg39f4t23j6qdspi4e5/88256149089.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cafa016c666---gijovazid.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/zegaririzosiriri.pdfIn PDF document text
    • https://congchung7.com/upload/file/kiruzapuvisexelujarasipe.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/52166415085.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/21498475653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=que+es+plasticidad+neuronal+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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 14872 bytes
SHA-256: 7a1fa7621e4eef7f7edc17846e0e7c67931bc3eebbadb5226c35bdaee599c713
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10772 bytes
SHA-256: 0a4f636bdf527596aee90df3f526582320873f29eeda16383e1cd34f77fe44db
font_02_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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