Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3c5bf6429e6dde…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 22:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0c05925dd5d6dd1734045fa7d7b3e30 SHA-1: 7bd04fea4c415c6fa7722461d165367e3f89a1b9 SHA-256: fb3c5bf6429e6ddeb8813c5650fe5d3508ac1a4e3c2b2e6acdcf8d6aa6243b2b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting domains. These links are likely intended to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dca0811c368---69707221168.pdf In PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/44447695839.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/52779468147.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/74174359683.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/58415500690.pdfIn PDF document text
    • http://ledins.lv/cms/file/jegakirimukevipozojiweri.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/mavolejule.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/34788077058.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/sogilalemetikowazedodaz.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/mepujezamunatawisugaror.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ff14b811a---jitavobilogategi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/moguxisevu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5c40a2f65d6b47587e4613499c725ee5/sofizakafolejuvabi.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/mesafomivejusufik.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/gomepumibogepika.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/75204710953.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0cbf54d0250503db5a27380a50d210e8/xolovobepimeji.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/dejududajelopetigogi.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/forosirafolirul.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/43861552960.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2c96bb44c28698be405727449034cb51/12571954619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=strategic+public+policy+vision+for+corporate+social+responsibility+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_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 16928 bytes
SHA-256: 8ce961047faf1a103029a750b58a519ce576ca710b3e1df9ca812359bb636481
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 11288 bytes
SHA-256: f445830840ea65f6290b1f98ac4f23d043f4d4cf88235d14f7f4b2c080cb5116