Malicious PDF — malware analysis report

Static analysis result for SHA-256 092482a5b0104b19…

MALICIOUS

PDF

88.8 KB Created: 2021-07-19 05:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a121572fb2f534161489c369dbbe2c86 SHA-1: e4970c95d8886851053f76827d87f543e84804a2 SHA-256: 092482a5b0104b19610143da0dbf7f2703931d81242e13419b047b88d29191eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting a phishing or redirection scheme. The PDF's structure and embedded links are designed to lure users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dd8341075a4e6f45261e9d2a574e2581/toxasozalureza.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/50275451813.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lezivoxejubaxiwur.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b5b13bbbebef3c3b74af42f6f6f0fad9/7325552558.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/ruzidanaseteronumid.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/77456632953.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/91788755983.pdfIn PDF document text
    • http://elma1.ru/!upload/files/43493206439.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c53b3f4d5---70353637643.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fe52e34c---didomogedegukinisu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/33342102939.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/vanibozoda.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gopafuvexawubenam.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060619171273499.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8641b6037092a86714caebdb17521582/14748714447.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/561dfe8158544bb81bbed86a66e58dbd/9694169336.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/31143810551.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98ed3595d---30336913687.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/kuwego.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/47192694497.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac47cce127---28194182933.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/v00f7ftrg58ild8v339omvahg3/lizowukawunofuxigawira.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea84f2fc7c---kokukorug.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608512a44deff---fakek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+whipped+cream+from+heavy+cream+by+handPDF link annotation
    • 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_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 17220 bytes
SHA-256: 7d3b3d678c2401e80861d608aafd4a8ac76ceaba34a5a58e553e198338f76e6b
font_01_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 11160 bytes
SHA-256: 064126b81ba474cd60086d700124f39f19d228df3b74e71051a3fa1d85ddb3b9
font_02_sfnt_off00013d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1