Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6535ef13b8d1980…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 16:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e7fee38ca1a4307842d7d7ea982d3a6 SHA-1: 629bada343e7c4b2e38f17744233eb18dddb33df SHA-256: e6535ef13b8d1980bc9541ace20facefe14e904bb5f2552b6250214950f7ae8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://motodubai.com/uploaded_images/files/16394383248.pdf In PDF document text
    • http://hcvitamin.com/webroot/img/files/womibavosigibosimizemilaz.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a83fb09f6f5---12109353428.pdfIn PDF document text
    • https://led7.ru/file/74899730915.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/30259375370.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/20545494615.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/44820678959.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ef938c90f9c4d729d9a11d5455147f88/7970703509.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/97445089009.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/30207561486.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/26404868208.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c898754e611766fde9d8fc533a72e873/denidibifenojakexekefatur.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/posavajokupipazoga.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/12949075827.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/per7s56mkku811hioei2ofr869/8196269775.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/18e34d7d092dfc068603bd621a989d12/dudedefazorero.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608091efcb217---dogigezerewuzomixadari.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/zobezufifuxexofozagibemaf.pdfIn PDF document text
    • https://sergiomauri.com/images/file/42124977341.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d06a2d7ab7c---43670023344.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/wukedizofenonijoroduje.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace0eed35d---21367318249.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/11109713863.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/86890664150.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad2083625---88898873922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=water+slime+without+glue+or+boraxPDF 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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 17104 bytes
SHA-256: 82329431ffa59a8262319e63f3af6502a778488c868b4d8db132a667ad050f1e
font_01_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 10872 bytes
SHA-256: 9e4d09a71ca4dca3ff61d5d1354553ae2aca8ab6e0eeb9f6766df4816b384fba
font_02_sfnt_off0001355f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1