Malicious PDF — malware analysis report

Static analysis result for SHA-256 0013dc77c440ea01…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 17:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d0c79e214d6cdeeddfa49c0d08dc16c SHA-1: a52c3d2c9b72953f54968e6b011569d508135e07 SHA-256: 0013dc77c440ea0179ff406a428f94ca4ca7a9e1b91d5e4961f4b8cab40ff81b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF identified by ML classifiers and ClamAV. It contains embedded JavaScript, which is likely used to execute malicious actions. The PDF also features a link farm pointing to various domains, many of which appear to be compromised WordPress sites, suggesting a phishing or malware distribution scheme. The primary attack vector is likely Spearphishing Attachment, with the embedded JavaScript facilitating further malicious activity.

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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3b000e6287799b70b37f13e84c9c7625/gutedeniropalom.pdf In PDF document text
    • http://zaun-produzent.de/userfiles/file/sifape.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491a30d51d---romena.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/gekapulikibivizareg.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d6035c3341c0f89cf5d5072122dabb2e/mufozowobojij.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/deleraxodajo.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/37268092309.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5a4767e7b---nosofiboge.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/xiwiw.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/86662245146.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/47101303317.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/mopef.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3377a4ae47---822413086.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/xidatigisor.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mqj0295rgg3o8f98ocjdoge4qb/fubetob.pdfIn PDF document text
    • http://apcmagon.com/userfiles/26673462088.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/96948051555.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/vadobixok.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a72bd4e4b---10649877904.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/87fae19c3c1bfd7734452269b7d5e469/zateloxinak.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2tsoo9v4pevdbc1pnamvu8hnoe/90163932337.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a7e64ef95b16fe443e451e9bdf2640a2/33111454595.pdfIn PDF document text
    • https://campermagazine.tv/public/file/21582164939.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b32eba608dc3ab1a931d42ee2cacc417/48950038082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=seepex+pump+catalog+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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 10776 bytes
SHA-256: 78a00cfe2403344bea811dfd3951e60164d564349b5420f6ec213555ce9678e0
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 17184 bytes
SHA-256: 28577d41768842eb6bdf230f83c35ea690756cf71c38a7c063ebf75774ddf878

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