Malicious PDF — malware analysis report

Static analysis result for SHA-256 d021394bc5b093de…

MALICIOUS

PDF

98.3 KB Created: 2021-06-29 21:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 917991a27af34d08832c361aa773c341 SHA-1: 624a42237bebe4a6d5ed86726c14093526bb53e8 SHA-256: d021394bc5b093ded38ea5c42dffe0b92ae745bef98ccff35d52d539728532b5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload sites, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/jikovimurozisebedugud.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091bedbb83c6---37635648828.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d2461dfd7cbb065fb8a7243793c4cca/lafejufubimodipewakewugum.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/590sg1927pb2v9c12iet6ng7hi/65274709039.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/62485579208.pdf
    • http://ubest.ru/images/file/76633837191.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/njm8dr87t2bl6mlguptl217gvh/7733188757.pdf
    • http://duszek-lasu.pl/userfiles/file/57741716461.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d3c22b4f---40096421718.pdf
    • http://kartywspomnien.pl/uploads/assets/file/42046570419.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5e89573afec0ce6e0082c486f8812e61/95153807922.pdf
    • http://lamorenj.com/userfiles/files/reseja.pdf
    • https://mobilieroccasion.fr/uploads/file/51580470346.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d189f53a2aae6cee0277b14537230431/dutaronolosewujozazarelup.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f054d5baf7---85242812776.pdf
    • https://bravo-hk.com/userfiles/file/sasufizumofadalegenisuj.pdf
    • http://meble-tk.pl/userfiles/file/9233919526.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/79843730582.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7e6f2c6fbbd09743407e3d0d8ada0bdb/setof.pdf
    • http://bichvan.vn/upload/files/xiwawaner.pdf
    • http://www.awakohchang.com/image/upload/File/384902733.pdf
    • http://22743333.com/userfiles/files/jamukuvekusugumedokebe.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2185e8b55487a57cbaea0125c01d20a2/45892089567.pdf
    • http://interwork.sk/userfiles/file/74342900971.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=praising+beauty+quotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d54.bin
2a31913f17d05e358d54dcf917fcdbeca4358276fa89ea223b08687b9f481d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 17296 bytes
font_01_sfnt_off000149de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149DE 16792 bytes
font_02_sfnt_off000161f5.bin
2810a76533bc1d577c31719d92858b276ebcdb24160d72a7386a56ec27d00047
pdf-font-stream PDF embedded font (sfnt) at offset 0x161F5 10740 bytes