Malicious PDF — malware analysis report

Static analysis result for SHA-256 33befb5dce66c54f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 22:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 452856ce2d1cdc1266abc0280a050e04 SHA-1: 7b6a35f974c78bae5ba9c102625997739d5dd63d SHA-256: 33befb5dce66c54f20a00ccf27162add79587169d6cc9b27a36f745d6f3b7eb3
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, forming a link farm. The document body is unreadable, but the heuristics indicate a pattern of directing users to external sites, likely for malicious purposes such as phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tries.cz/media/images/upload/file/bujiwukak.pdf In PDF document text
    • http://tradeweb.es/userfiles/file/jazemefoke.pdfIn PDF document text
    • http://chemicalengineers.ie/images/35825747431.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/muxebapavurabuximikus.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/91269111915.pdfIn PDF document text
    • http://billsky.ee/files/file/kejurugefa.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/vonarinomagunolamakiwo.pdfIn PDF document text
    • http://kite-surf.sk/files/30056994995.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vipadejogo.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/sezefuzakulotonijesigog.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/tuduvixakepapefa.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/60190577480.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/fedeluributesel.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/68539819740.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/81191643507.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/39841770399.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/bajanexobimowewuki.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/se2mei6tb8k71f1sgjbl19udhg/38269468957.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/joxefadare.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df142a245---8519335287.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8e0a2eea---gujemad.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca11950b9---motewazuzubij.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/19039497800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+to+do+when+android+phone+is+hackedPDF 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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 10736 bytes
SHA-256: d50140f690d472661ae7561516b3a6b8c3e34bc99dc551424667584dcb3af13e
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 17620 bytes
SHA-256: 904ecec8f99f900201d647bd81d9922e788173b933e6021b51d27b1463d91a8d
font_02_sfnt_off000130bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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