Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ae28f042b7e5c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 04:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40f24f12d2a5b1f71032df134acad00a SHA-1: 75489d6f7e325d2fb2a54587b6dec4e311d2878e SHA-256: ff3ae28f042b7e5cd27b350d0930769ea890b0bef2565ebb1317a9d4cbc893e0
156 Risk Score

Malware Insights

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

This PDF 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 sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://chcial.ru/uplcv?utm_term=modded+gta+online PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/2dl037cjdo0vtrjucao4clftd2/kozagatipe.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9a1509a9681cdb475609e815fad3c5b/goxonubuxexusoxub.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/nuxaje.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091401220770554.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/fesuvejugi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pqj63gr0gvp06hpirhomgvnb39/42761374881.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/14759665617.pdfIn PDF document text
    • http://cartopack.be/Images/file/10432531591.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/75752560079.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc1b94879---luwarunekanudumok.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/53182112860.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/45221563044.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/64349542736.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/80188245896.pdfIn PDF document text
    • https://iwistw.com/upload/files/55081627542.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tosoliwatekokajekepomid.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/lusabopawanuvuvogijofan.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/dosekafezixoze.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/14308554664.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613630f32ed65---ziguwoveroxafulovolez.pdfIn PDF document text
    • http://dasbluemchen.com/semevojewojexederujaxawu.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/46717827614.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/lapusivepufed.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/38936505705.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/gojusupadiwo.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_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 10148 bytes
SHA-256: 4cc2a1645fbe5ca742be0a946a15dea4167050c276d227a7b10eae867bd83cb5
font_02_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16728 bytes
SHA-256: 85fc6640540fddc15999f705c8de440cbdfcc0b8142e57af7f59b6826b7f4ba2

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