Malicious PDF — malware analysis report

Static analysis result for SHA-256 848f91e4de96bbcd…

MALICIOUS

PDF

103.4 KB Created: 2021-08-15 00:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 802e7955a8c7099a4fe032e8943e4dc0 SHA-1: ebaf0da73252ff0b6b9310342355a4ccb669fab3 SHA-256: 848f91e4de96bbcd13ec82df0b373c931fe394cb93b586d7004a31476ce8d107
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript stream and numerous links to compromised CMS uploads and disposable hosting indicate an attempt to redirect users to malicious sites. The primary attack pattern involves leveraging these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd1f035fc---88273226217.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe294ecd7d---3045541707.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/36491832464.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5c7eece303d406e157d56d1bf8f5a658/pijegadizomeduvamominatub.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086452967e93---35700667118.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3ccdca626ca6a02795fbb35b8902d732/mikid.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/67387789b6b3bd7621309310d28e6325/mevoxefekelafekuxezovam.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/89228748050.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607883ae71f0f---21768693543.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/jagavibapiletusafabag.pdfIn PDF document text
    • https://bloomeng.com/uploads/56000767513.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/malodamosezibonativizipe.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/35317918845.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/64472663269.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab21d96fdd---78838691590.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/denirabad.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/455afed7783c496cf1e71451d032a0fe/lufabuxurodukevoj.pdfIn PDF document text
    • http://davcpundri.com/css/file/livunodarevesubavikikofig.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/15492243052.pdfIn PDF document text
    • http://adveotec.com/img/file/21401845557.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1cd3f667---67502049094.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/rufawojaj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd20b57300---72347812373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=uc+irvine+admission+decision+datePDF 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_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 19376 bytes
SHA-256: 2d508cb8005dbacef1156f1c6147cf9d37a7d2fca260761f8ded2912066022f7
font_01_sfnt_off00015f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F84 10556 bytes
SHA-256: 1a13da1d7e0fce3476a1819127ef32ca67a7ab94f2a5a2b28f8efed147350d8a
font_02_sfnt_off0001779c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1779C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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