Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a62dc7f981981…

MALICIOUS

PDF

92.2 KB Created: 2021-09-17 21:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4f025038fe18648e2a64e93b09b1005 SHA-1: 8a16c6091a6fb525b570256418c488607486b7fe SHA-256: 888a62dc7f981981fdd6fdb37a6b9e2284d91e978f7c5174cecc84efe84be7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a 'utm_term' parameter in one URL indicates a phishing or spam campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://medvor.ru/uplcv?utm_term=pokemon+go+spoofer+download+android PDF link annotation
    • http://catherine-massage.com/ckfinder/userfiles/files/finejirosipu.pdfIn PDF document text
    • https://j26clean.com/upload/files/60947663763.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/xegebisudedokorale.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/27510832499.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4rll660d6ph1e7a5a82bi3r1g5/57274014764.pdfIn PDF document text
    • http://aminotp.com/upload/files/88329908384.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/42745950968.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1614007d396db1---80003023339.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/zubadibovonipukuk.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/moxopezama.pdfIn PDF document text
    • https://eclearusa.com/images/file/kojotekogudojowup.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/72069805330.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dbcbd733---xojubomopedane.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/99232537c48036f211d935f82ce986dd/madixavuzemi.pdfIn PDF document text
    • http://fohow77.ru/upload/file/15015758446.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dubisanojabuwa.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/68840039986.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/79170262127.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/00fd5271455207d40473008497886114/gaxiju.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zubes.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/bafatojutalivuletuf.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/89322402200.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0411941001631710184.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/30180412268.pdfIn PDF document text
    • 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_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 18376 bytes
SHA-256: 3f9104f58a306116451465c60ead64e4f6cb01cf3accf31d54c04074d2d7edaa
font_01_sfnt_off00013237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4E 10924 bytes
SHA-256: 4644c26bd5b25f6dae1af1e01cee162e64bc059b0dd27dee13e3cb797dba14e2

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