Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b859d21f2306c3…

MALICIOUS

PDF

100.1 KB Created: 2021-07-24 18:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06c5f1cf479a73748e487e28726e2532 SHA-1: 41c90b16e0733afee03cbf34fd5730cf56c7a712 SHA-256: a2b859d21f2306c365b2e3d548ea776f168b33627e8a2a2aa2d75ce822cf9373
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.rpv-drachten.nl/files/file/47241963869.pdf
    • https://kovosluzba-praha.cz/res/file/bafafexaxutokej.pdf
    • http://cuuhoatudong.com/upload/files/zewubiseselowinuboziw.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/99crpnsm751fl0kjogsv8g40v2/ribifugixevituvukinepele.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/27269627403.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/vabilobepalusufotamakun.pdf
    • http://learnersdigest.org/userfiles/file/wenarupadolowe.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/94851a6d7c2650502b9e16e096acd2ad/2826321003.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/307f69649235537732c7bebfab367c20/20976860073.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a193e965b---jiratomilamevobo.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948752a6beb---76416182434.pdf
    • https://hijaulumut.com/contents//files/dafutev.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/435e4bddf73f70528dcfd1b658441c6e/68360347407.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1553b7015---51907803450.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/kowepiva.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/77374025581.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04c8b17064---68606697006.pdf
    • http://parfumerieindex.nl/images/uploads/pegufibakef.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf38f92c7b---xinekimelidelixidorajesus.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16072147a2754d---viniwut.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1515c842d2c921ff4a8854ed562dcfb/81231200976.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32ff584c0---75155941872.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=warhammer+mortal+empires+fun+faction
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a7d.bin
5c8ae71039bbbfb3e52a777cde1a4a024e7da1a88655081ba9dc8bd5f4cf7444
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 21240 bytes
font_01_sfnt_off000151b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151B3 16792 bytes
font_02_sfnt_off000169ca.bin
85c8a6f3df432f278a92c958c640b7d9ff3f5204bf3708f029e398c84ac1ef53
pdf-font-stream PDF embedded font (sfnt) at offset 0x169CA 10840 bytes