Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff0ba7ea6cff257…

MALICIOUS

PDF

69.7 KB Created: 2021-09-01 18:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30e534e09926ccdd8de8a290dd7882fd SHA-1: 19d7c7f38b75fbafb6ed4d2151c2f255995e032e SHA-256: 6ff0ba7ea6cff257cf3f87f8c7fd9c18230629c6219120d4f8bfa7de7de2248a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these compromised sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d36e4e27298---29401682859.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061922134084.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kozexalivex.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb57022a047---62326289447.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0d2af74176b4220b4d8a407a22721ad2/59908494488.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/79997458115.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/14541643866.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9d73e76e193169f0fe17fca1d8764588/jokazaburufafiv.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/ronivarubodupozur.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/pirofimuwofute.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/16932034144.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/70440070386.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9f69bd95---sitatasumoxe.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pobakipefofifukitepob.pdfIn PDF document text
    • http://rc-modeller.se/images/file///5652643200.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/14835393601.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ibh95vviugu28ddhjm7sn4lbqg/7986163397.pdfIn PDF document text
    • http://poiskvod.ru/images/file/40811655865.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wupolibunu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214e56ed35---15066278987.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f349dc6f52---81710243051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=examples+of+personal+cultural+artifactsPDF 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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 14544 bytes
SHA-256: 51e4fb035180738643953476c08309a28f411cb8286a2ff10f65e1106e51c296
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10828 bytes
SHA-256: 7e8c8e9f9aa5ddc36fd3bb76a50152efbd8bc45d5f17e11adbbdf58b4834fd5a
font_02_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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