Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fbbf47d05e0a57…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 12:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 871537148a2a76a189c03cec9c4f70f8 SHA-1: 637df69d45837c46cb739db196845c77f13c842d SHA-256: 81fbbf47d05e0a5799c1f8d6a5ddb741489b7cc8e4a7fefc646e3e6b29ebeb09
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b43748ebc81---mudonoxokufalerik.pdf In PDF document text
    • https://reitinguok.lt/userfiles/file/14710794378.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/57245190795.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/77021807972.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/linunugozazoroxora.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jifovetukejunizotikub.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f2a164b225e56b27eeacf9caed4c337f/jegikerexuvapasuven.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6661b8c3a86d4d6068369fb591fe76c/11829327619.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/jigixetu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/lubopurabasib.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/17064504405.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/vanego.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/54497254266.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd7d0c407a---95317739989.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/77877551697.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/rowumizademixu.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/raxurafojulularivij.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91d187518f---62369387942.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/vopenifotitin.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10150305810.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20506930301.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/dujipurepubiguke.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zidigujurefimapibodusowug.pdfIn PDF document text
    • http://lejonhund.com/upload/ginamisebomokup.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/68531367713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=all+ppt+in+one+pdfPDF 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_off0000c186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 16116 bytes
SHA-256: f7dc6ec7057ca7bc3d72b750e3321b7d0802a7f0f157e243a8e21b86257b82e1
font_01_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 10044 bytes
SHA-256: 704cfd6add242f4ea23ba5e833efdb9302d9c1430ea40fb2b6c482f685b825a1

Open this report in the interactive analyzer, or submit your own file for analysis.