Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b1da7d9850a9a8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-07 20:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f427f777c184a6b9ada9f415a2d5359 SHA-1: 7f2f750b5ddfa37383b023daa17edd9a2236030d SHA-256: 29b1da7d9850a9a84ceac2dae5ca28148ea52bbbbe74d5037fbfc42d18caa4e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://smartickgroup.com/userfiles/guwifipoxexij.pdf In PDF document text
    • http://dobrasekacka.cz/userfiles/file/92789076164.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/64922660251.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a30a86deb69c0a88314524aee8c8cb3/41280412713.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f08c45a9aa9---51943547472.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/mizikewanoxaka.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160824c651630a---dipidopivafujipidi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160719a28d2e62---towoxet.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/705c48f020e407d6235448506d73be55/xamopijixoka.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/86e4434f83bc3d1e475a1895516bc954/tepitowusibuzu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4eda253e7---senovifalomog.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/viboxitojesenexit.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/uvbb9nm7s08ldik3d9j2ia44t1/foviweziwonuvomiteve.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/88724449826.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/38117600968.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5843c47a20d6d8b23d46a5ecc617d9d7/31632100639.pdfIn PDF document text
    • http://cl-pub.com/files/files/rusovesa.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/fogenolob.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/woxasirewan.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/22783122229.pdfIn PDF document text
    • https://signika.pl/Upload/file/43419170080.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/418f9d98aca37bf24ce2e9340444da12/67520411730.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/eec866e033f6e9b60e2bd4d5745c3856/85901961179.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210718_204940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=all+benefits+of+forever+aloe+vera+gelPDF 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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 10576 bytes
SHA-256: 2b185f7b8f1b19adc23b7b8d4b91b9672e9ec83b82e7b17ca4f8ee15a82b9452
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16296 bytes
SHA-256: bd18cbaf1fd6e75167d5c44582308ae684aafbf3ce0336c5dcdfcd7a479c5cdd
font_02_sfnt_off00013a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1