Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a45333f5929aeb…

MALICIOUS

PDF

73.0 KB Created: 2021-10-02 19:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9be2195d6390e061ccb009779bac714a SHA-1: d58edb5b5245b37be252cfb9b6c3538c990f3785 SHA-256: b2a45333f5929aeb9ec1e9dc244616f16b629558f08ce9ad7753390523984d8c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload, and others on disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The PDF structure itself appears to be generated by wkhtmltopdf, which can be abused to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=proverbs+about+lying PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f1frivdtjo0g6rvelt1n9btp3k/luses.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/nogebazifolemikoruzutijin.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nipomizegejonigamafoka.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/17014575231.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/miwinuno.pdfIn PDF document text
    • http://ellev.fr/upload/files/60693811174.pdfIn PDF document text
    • https://bnovum.hu/downloads/winuzagelizonure.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifofit.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/88998966400.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/finiloxigakadu.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/xefovej.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68122275181.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/lufulikudasopawefuwimira.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/pizajira.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3cf4c9216---towajuvi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141b79c865a2---83428032585.pdfIn PDF document text
    • http://pvvc.cz/files/97212980130.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/muzujitonud.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/nivobujujatanosug.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/xisomomiri.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/maxakalonon.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403202e1b09---fuduxobetozepirakunurobu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/54954852706.pdfIn PDF document text
    • http://grimastone.ru/files/xulexuvonusadivim.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bigawedaga.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_off0000b65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 18412 bytes
SHA-256: c6c216fe5c4c4a321be7f45a2c7fa94b640fc6c90c41b23f28233de38c6c7c8b
font_02_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 10704 bytes
SHA-256: b9e55a910e2604fbffef388a8206d30619c974a9c94ae311cdcbb4703fc947c0