Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1c6bcc51716309…

MALICIOUS

PDF

82.3 KB Created: 2021-06-28 22:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a210537058bf0058a61bc5f79e650ad SHA-1: 54463a2e974f9007406e1fad006e4430d73659e2 SHA-256: 2b1c6bcc517163097f139ad571971a8b8e7b3bca75254125a8e7ba1729d61d13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites which in turn host other PDF files. The presence of numerous external URIs and the use of compromised CMS upload storage suggest a distribution mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b0a3390c---todizipiletifovumidakud.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/papadamoxivanidujuw.pdf
    • http://www.yoko-ono.be/images/userfiles/file/derojilosomesuv.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b978623e5cf---juramolumenubevaboleril.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9f11sr7q2mjv35fbhre270vqvq/kepilumivubujidimo.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nb6j8ucs2vvl9n3336hpr4g5qd/74868559435.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e95d004ac---84661031612.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c463a6c6---duzezupovajagepif.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gh6o25uqe5do26ve7q9u96tds7/62002735072.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeac963ab9---85915309541.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1d551679c6e95e8c1a45f99a21eca4fa/79871731784.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090614f8de73---nexol.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8d375b34491f1cc2952548851a3f1f39/41129025684.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ff3966dc---55875982885.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd81c68fdf---16702094897.pdf
    • http://plafondchauffant.fr//img/user/file/63541836657.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/75044051308.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077df45ad1c8---43423913864.pdf
    • https://condominiovillage.com/userfiles/file/sitixasekazupisetu.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09f4aeb5c---wifufiluviratogunakufo.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898bfc3efc5---suvijojabavapudutir.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3217f8d55c---rixikedasupunedavo.pdf
    • https://kurtoglumob.com/upload/file/kagosijowukosobidivux.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c854fb06f5a---91132851110.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/jepul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=africa+trivia+questions+and+answers
    • 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_off0000dd0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16792 bytes
font_01_sfnt_off0000f522.bin
342f276e191d2c46d7b76a7af5e5e358910499a2ac314ff886b72fe9e24f43d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 10804 bytes
font_02_sfnt_off00010e15.bin
7b291e8b42b9e6b11c8ff652de5731abde05b54452c47d2c523c6f9b0d9c7a11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 17720 bytes