Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca56034ea215c12…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 05:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2c9a98c448597fa6fbe06689d556ff5 SHA-1: fcff3bc0a770399181bfc27e9d68a7ee148e5ef3 SHA-256: aca56034ea215c124f6324821082e3e61fa064a698a567523ca0a3acc57c1bab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=sinusoides+hepaticos+pdf PDF link annotation
    • http://www.rannatennis.ee/data/upfiles/files/pawusolajun.pdfIn PDF document text
    • http://biosite.ru/images/news/file/82071010139.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560eed6a53---21906190201.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/45b7cf3756bd65ed775b08c2fafc1f75/ruwadosi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hh59knsa041j1n0d72a08ema5q/9881707908.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/kadijejarenolebiwebubu.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/kususuxezadosiku.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jvci2ao1hqna25s7r37g3vqub3/falovasanudataferenaneze.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088074001db3---figinikobodubapizosinub.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/xazojo.pdfIn PDF document text
    • https://qkon.ca/images/file/94851066254.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/e9c4433063f6ea64059203f5c821cdea/22195329717.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/71e3e66c5b50b2e1fd8b2b727f56c308/mejutikulatukixiwuf.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/dadizuno.pdfIn PDF document text
    • http://mlight.cz/archiv/file/wafexiwalezoli.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210901015714154.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gujalikafatigosagilixa.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/lonerozu.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210722_110003.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/84026843055.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/fazodefopojope.pdfIn PDF document text
    • http://jsdarvin.com/files/nimoxejufibikorifuref.pdfIn PDF document text
    • http://billsky.ee/files/file/34413098966.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_off0000bfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCC 10748 bytes
SHA-256: 53b77b49bfd389a58eec0521777fac854275d171133383d31e118b328b5bfe21
font_01_sfnt_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 16052 bytes
SHA-256: 53da2552cdd86a73864a4ebdab5dd86538c3c4d3c25807d1874ed90c9dd91edf
font_02_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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