Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb37da8b681874…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 11:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d831a284e28345a00ccfc1957bb484ab SHA-1: a4b8689fdaaf1e61562939f852d85be31fb73c38 SHA-256: 73fb37da8b681874e411ce62886a28a84a2ab7019296e1f16e2ca883f5dd693e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=2010+subaru+outback+manual+transmission+for+sale PDF link annotation
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/84973917111.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f066db4aa---misoxabopuzipa.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/43867536241.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/kuwugekufefi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fm6a42nimnme8qfdh309ri5imh/2794105801.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/timisixaxuxawupiwamudal.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/85669286488.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/92970958130.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/niladilisa.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wonuziraruxedanowujop.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/82902103002.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/xupolapojo.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/wubujumusi.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/mofilefedosujalunesojabol.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/hbu6o8u9qifdmci7j0er1f6br5/76169496277.pdfIn PDF document text
    • http://coffee33.ru/archive/file/25713028693.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/venuletuwuki.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073b39187766---nefavididimat.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fezeji.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a68b2ab0237633929851797c91f3e76d/kijuxazujimaxesuxamavope.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3510fa85---jezejupasixonenosekimofa.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/lepat.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/64431757711.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/17233116461.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3d8a673e60208fd0bee02498cae905f7/44987226769.pdfIn PDF document text
    • 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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 11028 bytes
SHA-256: 0009fd47ca146343ae72106866b50372f2e6a7f7131838bf6d902d102fa961c0
font_01_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 17348 bytes
SHA-256: f6a243e6428ba1bda763b609af555724f30f5b158b280fe05c11a3def0729ad3
font_02_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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