Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3503558ee94b66…

MALICIOUS

PDF

92.8 KB Created: 2021-07-04 13:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6142d0b64b5b934393aee920fa709212 SHA-1: cc9a8cb5e8c84a04c2bae3a7f1807c797af49d45 SHA-256: 3a3503558ee94b666600281607294a656bafdd0f5efc56bc3df4fe82ce8ac620
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://299-45.com/CKEdit/upload/files/saginawani.pdf In PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/doxiw.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/gunezanufosipepevi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607806056301b---26499116358.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd256129877---22651871908.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/700d1ceb967a73fd3e412ff59dd37e2d/88584682768.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/vizerib.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/33563480407.pdfIn PDF document text
    • http://gtshotel.it/images/file/fitaf.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/3873553478.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/70008970932.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/23504930037.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/49269953604.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799bb005567---91607677675.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://vieclamday.com/userfiles/file/43875673815.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c52a149b977ad9f8802f17073701a5a8/92310466279.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/webunaveraxipubom.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158f0723ed---xibogape.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/48707809431.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb6b3a9d0---38434171714.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/ziwupiniko.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/02t58e1a11tetk4mh9fhsa3otn/loneliganebubipev.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/04b78bda606bbbc8ab79b447747e28cc/vavibutikunorasexaxe.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f953b9e8b---bosuropojopulovarete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pennine+way+routePDF 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_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 17056 bytes
SHA-256: 26753bd1ad9172e1611e2b2d6bd30ab49a275d0d1946cdcf74433c1303410197
font_01_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 10188 bytes
SHA-256: 85b707abd62ad93dd8e9ded9fa0c7a3a702fd68d8c926bc0c041790f713efa1b
font_02_sfnt_off00014e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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