Malicious PDF — malware analysis report

Static analysis result for SHA-256 381c3a7a2e85475f…

MALICIOUS

PDF

112.0 KB Created: 2021-06-28 14:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fbce353773116f2fca28132e6aa59b5 SHA-1: f32fe01acd74ab4f2d58dd9fb9b08a07c596efab SHA-256: 381c3a7a2e85475f98ad3a0c8b906003b4f461b2e4d0a6e6fc708bbc4d6aec37
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate a malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/65357908902.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdf5845fa---bagubexenak.pdf
    • http://shs1977reunion.com/clients/41590/File/boxubinujarakireneg.pdf
    • http://mamam.by/upload/File/file/fobelaviputu.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vkdmoc7uhujipggr27l5tb2947/4141888228.pdf
    • http://daming-school.com/userfiles/file/luviziwexofezamo.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/66162534750.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/eedf9b6be89cf2b721606c7b7a5ba2be/50999091202.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503220046990796.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/23a32445a0ea9c99e24d85079c066aa2/29647961378.pdf
    • http://wsp.pl/userfiles/file/vuwoz.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfbd74616f---80167495551.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2bb6deb71de33c4190227eed9d166243/30178636035.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/897g8q4l9si2gd3119dmci3kdb/78070283497.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160930fb5d8ac7---9180747529.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160764152adb5a---82878705738.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a0ebc31d---48850222671.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2f503f39d6310d3632e57ef621727527/rofedafafopepuxukujowurud.pdf
    • https://topclassgreenery.nl/images/file/pifulu.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9d7c416a20b79cbb14b7a55a7967f9eb/3109326306.pdf
    • http://flexa.cz/docs/file/38104702759.pdf
    • http://tetraeng.it/userfiles/files/52941422837.pdf
    • http://orderbestwings.com/uploads/files/zumojobabofilalimolojaka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=philip+father+of+alexander
    • 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_off000153f1.bin
c7ae53390e8619be77e2a71cdfa09a2e611a733207d56ca806f63d878115e506
pdf-font-stream PDF embedded font (sfnt) at offset 0x153F1 18048 bytes
font_01_sfnt_off000182d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x182D5 16792 bytes
font_02_sfnt_off00019aec.bin
8819c4f94568950a192c7cf60d767f60b21a56cbf1c8cecf9f64d4dfbbfac75c
pdf-font-stream PDF embedded font (sfnt) at offset 0x19AEC 10532 bytes