Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc652af7e96becb3…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 23:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 898b486b3e314a20845160140d1ed7c9 SHA-1: 40b026e7f25d77425c83ec1a6243f5b5f735a5be SHA-256: bc652af7e96becb39d3fe9959b39a3aba8d39f558cb02bdb3369188d77de1e84
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting domains, suggesting an attempt to distribute further malicious content. The presence of multiple external URIs and a link farm indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fanti-fitness.pl/uploads/assets/file/87425844433.pdf In PDF document text
    • https://banderlogclub.ru/Files/file/70321731639.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///38937776126.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094679093cdd---xafirukemaxevugeroluvi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160db490a7eceb---zizuwekez.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323d5ee322---31776177809.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/90624054474.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/13500509854.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/kagesojofosiwazusumemore.pdfIn PDF document text
    • http://valeneighbors.com/userimages/dawubun.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c17c71b9f1a---nimoxodulesazejupiketik.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/945b5562c915d44b97d1c94e8ae07613/xadijedawuxedufofiniwab.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a319fd174b---lijinidadasez.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/78cf8a235e9207daf0d3822cf83dab9f/fowalorilapekoxor.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7d2f7fae0979967c83537730492ddfc2/2451498797.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/vejuvimov.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1jpf91e777am0gtpvqk29ih2dg/58380188759.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/wirututopep.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091749264170---49280860088.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/23193013057.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/gixaximidepikipotes.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/16298033534.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3644a32aaedac13a29e6d7f2ea451b25/jogabevisefa.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1f46eb0456849c7db8868994bd1dcf3c/54569813067.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba003a60fee---31426821911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=five+nights+at+freddy%27s+hw+apk+free+downloadPDF 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_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 16416 bytes
SHA-256: 0bc0d5fd4620d400bf4e211c47a5342beace02199f9266a36a87b32526c7e38c
font_01_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 11148 bytes
SHA-256: 66ef95ff0389c03d15149e3949fc8384dc4a27f7c85256e975fea854e3cd951e