Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57bf2164bbdc876…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 12:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c02d3824b268d9475e0733b8a0a0195 SHA-1: 941e30d9ad14b4faafc305c20e7000ea423a4f78 SHA-256: f57bf2164bbdc876fcad393c0f963dcdcd8d63ce9ae8e1b7c9c7db1435b4b633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=relationship+between+ethics+and+morality+pdf PDF link annotation
    • http://cz-synergy.cz/data/file/6572403823.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0q987uneqggsdidkg9apj4qjmr/12997158547.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/88328009747.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210619060601_xy2ij3.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/67144102722.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/92347670727.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/sopojituvukisoxuvat.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992f1c337e7---gitazaruseli.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cbe1q6jpjpmsv53jqfm7kv5inh/5785638559.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202108181815157293.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wulekunagal.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/86025180659.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c465af0048d---26729088804.pdfIn PDF document text
    • https://businesslife.com/content/file/75060905388.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/37705798027.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/kozazigupurezugisijiwixap.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/foxigijijofifolotodikip.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/612add6567c8925ef3153c99150cf9e6/75070445625.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce8fd21b9d---93647548529.pdfIn PDF document text
    • http://hncastlecable.com/d/files/27967449470.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b11b65b87---jutanutubuvi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958b7eeab33---8790129756.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/22944610200.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/91514190073.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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 11268 bytes
SHA-256: c65fcda6e9ad7590ed524bf778a94ab237baf2d55161528c5402ce52b78f85b1
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 18244 bytes
SHA-256: 344dbb2b79f2c34602950b9bea2857a7807ba98072f9115d286fa0d7fba55277

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