Malicious PDF — malware analysis report

Static analysis result for SHA-256 57346260c90d40fe…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 20:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 50915abad720fc04e1650f20a46869a8 SHA-1: cd6b3b74bfc525d1c89574efe63aad9dd1f5ccd0 SHA-256: 57346260c90d40fe0ae522519836c8e432ccddaf6f160eee93e247dc9253bc60
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=android+tv+vs+samsung PDF link annotation
    • https://chameleoncoupons.com/adgprocessing/uploads/files/6230419635.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1c31d66---22633286839.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137264dc882f---nalirorusowomuvixanu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/94920026726.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cada9f1c6---zilokefukagebilare.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/kegexomofefotin.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/42771350377.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_074706.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109141223344360.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/pivopososefumonewak.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/girutazig.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/venovewerisomot.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/78933972101.pdfIn PDF document text
    • http://telektrans.hu/editor_up/46491985587.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614236f59309b---sibezazasudove.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210922012902.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zizaritejasizi.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/vepeduxe.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/ralelelad.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/18806436382.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/22508063586.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_off0000bdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 10560 bytes
SHA-256: f81ca3fe076edd6eadeca50564cd022dd18513b49eb0d20162699963bf8f2f89
font_02_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 16344 bytes
SHA-256: 747bc916984b6b4324ebafa55fe06d09cf5560d6f60d5a4bbb74e975dcffb819