Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1f0663758ea0aa…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 23:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91067ff73df8926ee56eb1da1be44c80 SHA-1: c88ae4f298dfc5bf6bdde060ffa247c5980b006d SHA-256: 6e1f0663758ea0aa1496983250592f80e9af4b0eb9646fe03a0268bbb6770c33
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may exploit PDF vulnerabilities or lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/17580b023ded916150b4207e71ae10de/naxutidunusokasunufujud.pdf In PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/7882658108.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11653858856098aa621c786.pdfIn PDF document text
    • http://iphysiology.ru/upload/galukadosoribumirexebep.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca17e344b---deramipudulenowopimazesu.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/keradegeru.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38147053109.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/lovefux.pdfIn PDF document text
    • http://orderkai.com/uploads/files/wunegureneru.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/36c12d0c552116c44eff39a7746a246c/41172569058.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/fimomi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/55379454121.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce07354668---20144084912.pdfIn PDF document text
    • http://kleiberit.ru/files/file/86651644043.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/xazomalenazajixidaxodibis.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/moduberivopebirifanuje.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210805_3F02BDE4572AF329.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/57650352543.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/nevojusajeguxavozimelija.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070e5dc773---93107128136.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/nanuwixelok.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/47887406929.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/65255820656.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/jopuselazutasinexug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kurma+avatar+story+in+telugu+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_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 11112 bytes
SHA-256: 1ab02b821d35d6927eb92068c67dd199c121f652ad36982d7cd3d9b8731d25e9
font_02_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 19888 bytes
SHA-256: 5dd11cfbf4abae12b27bc759f68b4fe1195b5b17ec393978e1917d30e7e5802c

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