Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b62d69a74c02d0…

MALICIOUS

PDF

73.7 KB Created: 2021-08-29 15:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5dcd1dd1055a1b0029240ec48bfcd713 SHA-1: 527fb7cd8ecc3e6410b396dfb6f1be04161784d3 SHA-256: e1b62d69a74c02d063bf2ea69efde04c03febc62c15ea52984792d7b7057a6c9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites, likely as part of a broader phishing campaign.

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e369e662df---97615674041.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d983b68fd1c---63607189626.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/63951041481.pdfIn PDF document text
    • http://vanhacollection.com/images/files/bofezefufimenekatabigabit.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/89624025618.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/44819113262.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/c7f6903447855edc86931fb0c01bddb3/nosatunososudej.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/wekozatif.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/jdpi406hn2n3vak4873nvmscpr/22061012869.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/muradogeluxasavixawege.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/zofisumisuxeveda.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/60704323276.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/uoebkrarh6lmf3p9cmq9p5q784/39631291181.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/e49kkio9nbbutj779eblelnsdm/xatomafimenigexunezofaj.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a9f4e88c---64432181286.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/baxaretozorinexak.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1ea1174e---sewijejig.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/sevit.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b60cdd41---pupobejebagazezanaxu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/dce567d1c0624ace5d2725eaecc3a7f5/15934706200.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/57241169359.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430040831788964.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bipejonotumoxoxu.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/monezekotiduju.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c09327db---89726954105.pdfIn PDF document text
    • http://www.fotolia.com'&gtIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+miss+you+emoji+copy+and+pastePDF link annotation
    • http://www.fotolia.comIn PDF document text
    • 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_off0000bf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 10824 bytes
SHA-256: 10501212de33d76d224e48392e5ce3ae49a0348a8fb907ee5358d9df686bd99f
font_02_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 16164 bytes
SHA-256: 6a7b5ebf2be17c931a1db0d93cf8fd5e52bf7c06e65047c01335997ab51a2c04