Malicious PDF — malware analysis report

Static analysis result for SHA-256 252fb9bee815d300…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 18:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 047c2f993f6bef7fc062d76e49d2e44c SHA-1: 899a596f00b452d4d2e7577fb3bdae94c100d627 SHA-256: 252fb9bee815d3002fba088a2ca189ed8abde6f15311dbebf18f822fea15b0be
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e3438f93---vokezesirufutozijisavizut.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0b6c7ff5c---diketanokepebutefu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7135991b612f7a23b6f9df92287d844c/59213202155.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/81082986082.pdfIn PDF document text
    • http://greenbrier101.com/userimages/xipuzasu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/orslu4jegf7vn252deai57ef22/xotutevubojis.pdfIn PDF document text
    • https://gornjastubica.hr/files/84407922388.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/2525241001.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84a2650b9---nireti.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/66640763425.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/71727604266.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/katusazevuxa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac0d45879---sigifujalavemigonuworaxi.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/5527545330.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/1jv1b3clu64blt0k864jgahfv5/27169920403.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf01accff7---95243770245.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/zolemenufivubizonara.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ba7967b---kodilekumanepewiv.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/67070660836.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/nilaferodoputisase.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b52a069d4ecb3a1a19c70ff6f7fbd18e/segilebidiwegivaluwupu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5e8ce73c0b9264f25964a95820646892/48611123277.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/pefajevifubebuxegiwixovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=editing+a+friendly+letter+worksheetPDF 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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 10908 bytes
SHA-256: 50df61acc4b2f2e453ea15d0c88488b55925011b08cec845adfb6489b390bc44
font_01_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 18128 bytes
SHA-256: 6c506dd1a16c48fa16f2ff24252b076b5d17805cdf9bdeef910ce283131ffe62
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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