Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62323c1c768da63…

MALICIOUS

PDF

69.4 KB Created: 2021-09-11 00:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6293480cb9116150976e642df839e27 SHA-1: 499695b8753d18f5a89b866259ea0c094c20710c SHA-256: b62323c1c768da6361cd7f70cb72870f55292847e91f5cf77632204d40ae97c3
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://goldmustang.com/files/files/61694298489.pdf In PDF document text
    • http://alhouti.com/userfiles/file/digorazivatufetixofeb.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/56935754261.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/najigij.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/34071912343.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/11893783560.pdfIn PDF document text
    • http://csp.hu/editor_up/tutipudekekovo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377098d1ef9---10858280196.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/semofag.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/6261697484.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/26971001560.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/muwujagitipekemesanatij.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/28186184087.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/sizazunis.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202197_55854_863.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/25335110257.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98578442006.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd618cca9---30361503098.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/90199076236.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/rakafonepavitefekomu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c3d0c939485f55829dfef414a4ea81fb/57961019832.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zudutinakitogadu.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/64117122262.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/3531343959.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/futoganaxoxufagow.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/dujamuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=justice+league+dark+2017+free+downloadPDF 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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 14748 bytes
SHA-256: 92bd948ad68b415b682e4e5ed8342d22eb329595a1815bb9e90b2bb68cd4bc45
font_01_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 11264 bytes
SHA-256: 99ad1f23fbe9683fba9c8dd7f730647ded05c57c07bce72175323e1f0712e740
font_02_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1