Malicious PDF — malware analysis report

Static analysis result for SHA-256 459126a6532ab2ac…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 05:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8221e9b3e3779b3bd7a52e04495c54c7 SHA-1: eb3ec192bac2eafd1aeba6dd1531f99875b072bb SHA-256: 459126a6532ab2ac0e062126591d011ac0cc521d3369c69772dcd47e72172aeb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and extensive URL list are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=a+metrical+foot+consisting+of+two+syllables PDF link annotation
    • http://cintabogor.com/Uploads/userfiles/files/rojemuf.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/117695637160a94ec54adf2.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e0563cc000c2d2660196baa51e6473b3/95530583363.pdfIn PDF document text
    • http://ccadl.com/files/20210822045452.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/38499545871.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u26hlgnubb9niqrgjhjiub9et2/pokuwiritodavogaxi.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/zetudanid.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b7e1f4f571883f28f13b3be626f7b7fb/18943863827.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1ikubhbkbam8g797lsq2m9uho4/65058721342.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/juvububiluzerafob.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bnqgi5ktkt52ejduosl2u3p2oc/83028738841.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/wegivomigir.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/rujola.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/66321411981.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/78348689600.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/30914232829.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/48373060185.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/8367505912.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/263294227.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/4351037660d6080eeedf6.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/tesexijopiviruraxep.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3982538da6---81852987457.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/mebufaga.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/mitatifupuvitimiminofuga.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160711fc2e46f8---62908047571.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 11000 bytes
SHA-256: 080e7738d85101af62e35befc72864aca391718bc419c940669f6e78dd9a4596
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 17952 bytes
SHA-256: c921e3a3f6869bfea2b78fe15c8f6a91fe69b90a283f0813c1b51ea31b2caad0

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