Malicious PDF — malware analysis report

Static analysis result for SHA-256 591ff056b7a4031b…

MALICIOUS

PDF

86.8 KB Created: 2021-08-02 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa8a69c27e1ad776d6043bc124f2af41 SHA-1: 68de368556460b7439221386dca6830fe6950a53 SHA-256: 591ff056b7a4031bd6c08cd9d963ee98d2a642d01fd65d65b5687633e10a345a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ab64647cd0807b2ffe65513567f83320/fibufoxujugogubesebo.pdf In PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sotabizelu.pdfIn PDF document text
    • https://puppometalli.eu/file/zogotigotujatekafip.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a54c24bf9---zetiro.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3af99d415be1ba61ade317e5ae35d417/funesixanasigalolosatuxir.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/niwedesikuzejafek.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0862ce8059---91437993593.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a36c0dd1e---gadonimitux.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e1c6cd7af18c5b7981b4f7e2bc50788b/32091127049.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/3524958041.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/33874995809.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/sinexaziwipipi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/wawakazoloselobopo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0gbmevr8rieom4mni86gqlq8nl/93330504924.pdfIn PDF document text
    • https://digiconelectronics.com/media/dosutuxawub.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/a872bb57a395e9f487d4aec582ea36fe/8985678473.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/ponuvig.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jn7s8nf3pn3th1bonhfma6lvap/femejivexozagedi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb1d4a84ad---farugevolanofokage.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44d1d45462---kejozikotesotire.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/64719189294.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204922e7f1---66350387883.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/3e7i6p63rbuq89da7ir7rojn3c/saxeno.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/nalivefaxavatiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cursive+handwriting+practice+worksheet+makerPDF 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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 11288 bytes
SHA-256: 470da9fb49feb927e20bfd6ac2e762603992f19792aa85d4a6aff7c426e3d31c
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 17588 bytes
SHA-256: a2425fccaa7a2a71c50f82d18a583556842fd9d23242d7208044f7e4199e8fc4
font_02_sfnt_off00013571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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