Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e240ef0421e14a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58a3328af0d90946493b0603145ee831 SHA-1: 388595dbcce559ff6d1e088d37133acef8ca6415 SHA-256: f3e240ef0421e14a0cc6b338493dd383f48dd137261d0de1924854598d369598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, specifically pointing to URLs that are likely part of a phishing or malware distribution scheme. The presence of multiple unknown URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e1baa7266---72246047278.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/zivoruj.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210610_9991BBA503F58AAF.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/54663114521.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f03e0cc9---45053720132.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rujilewififekusajif.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/ximiti.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lb3bfmn2gpa59j5s47cmp29i4g/76453377946.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/giloderebazadijuwepadono.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/gasurapizoxu.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/noxarateliduraj.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/284fe3cf68260469f5723163262aff8a/tinufizenasevezudutorizo.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/80380424985.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/26179140336.pdfIn PDF document text
    • http://scro.ru/pic/file/wagupa.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6576d59c6---pexelonokexokusuzepukuke.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/61883643928.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16104a04cab2ac---15172501439.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/pizikizekuvopinagof.pdfIn PDF document text
    • http://foxhill101.com/userimages/wumazujudukes.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/26048637771.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506093637197508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=static+electricity+class+8+notesPDF 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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 10620 bytes
SHA-256: cc61ae59f1ffc80004f754cb911381273b836da7b2fb8b057d709838a41374c6
font_02_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 15980 bytes
SHA-256: 94b5185f2cb781721978a9ac69f349a9ec9d004ab59924b1c33a27e0a5ff90e6

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