Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcc49df389fe46e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 23:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5753f0b5ed3310d021d888620274ef0d SHA-1: 0a47147e362d497fad713d2a934cd9aafcd0ee1a SHA-256: ffcc49df389fe46ecc6659815bd9157f8b5cf7cf449456cb72b4bbdac82de9fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbceccbbf2---60707013821.pdf In PDF document text
    • http://elmbbq.com/uploads/files/gazugomo.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/35657726154.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a8581d29---56855859778.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe251a127e---xixulugulevamixoj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160791a674c0b4---40680836897.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/26067249831db0a53d48aa784eddc580/tunokade.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119c0ad57ec8---pukugetemeluse.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/36520778401.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/watemumorovu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a262c4eb0471afb9c3d5960285526340/34297567741.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f2f746ca43a682bdf0e7dff9a0429d0e/8623995639.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wofaripamugevifevixu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1ba31f12360023ffc629d3c06b1b6103/tirikesufuvadasepuro.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4b383c25c---29477938190.pdfIn PDF document text
    • http://orthopediedelft.eu/files/15146832122.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210717_063401_192.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qcvtm79g3q94q7l0igit5gevd2/45257539755.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4aa32e9468---20999390234.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0e8498585428081af8af2a0e1b04e898/18136540943.pdfIn PDF document text
    • http://m2m2design.com/userfiles/terozituralegixowixozaje.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/20499363722.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/80439288507.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/45406401077.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/xigebukana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+del+propietario+suzuki+swift+2015+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_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 17336 bytes
SHA-256: 0348a623d47ad76f7676a5e0933334ec8cb2a3f7b0d2565f0f1c516cb8bac236
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 11248 bytes
SHA-256: 6275a70238d9fa402e8dfc1eeae4ee2deb52d5188c5ce45b3f3eb0b75a97973b

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