Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7ec9cadfe4156c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 19:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23aaa97b46af94b83a29480a5a469ecf SHA-1: df1818bd3a50d3bbb23864dee2747e2b65c226ec SHA-256: 5f7ec9cadfe4156ca8b31862736565daa00da3c0e5f01fdd6e2ad7ee5475f1ad
212 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting it's designed to deliver a second-stage payload. The presence of a 'download button' lure and password instructions for an archive further indicates a phishing or malware distribution attempt. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16111faf686433---80397615075.pdf In PDF document text
    • https://sweetburden.com/upload/users/files/51729953783.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/relodokibititanejirivu.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wolupuvolakovap.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/fokapawiruk.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/viduzexijojepode.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0d9620a73a293c034f405f6f2306e750/34590832765.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd615bd06b---78443198289.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ol903nlbhqeo28do7n3dto105j/95616714011.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/52f6ceb1e33082f34c627947a7f188a9/netuniji.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/97492868669.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j8qua0vtdph48cs6aij7hbi4r4/fasiwuv.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/xatopeni.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608870990b6bb---gatiga.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c7544b4f4fd---89239643359.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0896e4b4a---davedokorewugusufebipaxos.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/9452217634.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/45155792153.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/91026487955.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/19970427570.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d582c9b62d---30538214337.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/dogaxapaxirogose.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/54960603022.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/46555923572.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8tjnjrfr3ll7g74cnbe1g5r1ed/kuboke.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/sekapevosinanutas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=worksheet+for+class+2+evs+plantsPDF 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 17356 bytes
SHA-256: 954e70a85884dde851fa7154257a151d87ac2b5b03305a5b40b63515d5d38de8
font_01_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 10756 bytes
SHA-256: b685b01118c36eb97b5104187ea6944298e6d99119452493604a94653f399d3e

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