Malicious PDF — malware analysis report

Static analysis result for SHA-256 f641e3289a8a99da…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 06:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e575c9c28c865fe4bba8c1d8e668ad62 SHA-1: 01ceb601dc7bdda922573269bc80c00c3d9df8f5 SHA-256: f641e3289a8a99dae123fe8fd54cd288e7f7dbe596fff83324c4dc15bfde4e67
176 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 functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2024f30c---22499121009.pdf
    • http://dzirerealtors.com/uploads/suvewig.pdf
    • https://mkart.it/uploads/file/buvapedopik.pdf
    • https://acrgruppe.de/userfiles/file/44682462715.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/df35f58083468a8b57ce16a81f8d0136/69198868946.pdf
    • https://c-effeimmobiliare.it/file/lakibewitazaroti.pdf
    • http://formel1vermietung.de/userfiles/file/gokidijizod.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a833397f---rijut.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/magopudinavofuboxito.pdf
    • http://copy2d.com/ftp/image/file/xenovapolifagipurif.pdf
    • https://psfund.org/public/uploads/files/cms_files/42212237042.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706adae55ae---tuwibibazikuno.pdf
    • http://mimarkamilozkartal.com/userfiles/files/dilifamaf.pdf
    • http://quatangsongvan.com/hinhanh_fckeditor/file/2846070516.pdf
    • http://rjbmachinery.com/d/files/27861615864.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/jitixikulidovozizizeb.pdf
    • https://gencatakan.com/upload/file/wakinoketuni.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gajuxededazojobib.pdf
    • https://vestol.bg/files/file/76053222466.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2mp9fll1s0b1cnhhd9dpka7r27/88463615333.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe253e5d2---kuripobobetituxili.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/notilifuwejud.pdf
    • https://takipcisec.com/calisma2/files/uploads/walorejedesukifutofomizi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=media+and+information+literacy+module+grade+11+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b5.bin
2e6de0c73dfdf66b18aea489d710b364263ecf3978f40a1bc3cc7d948d372558
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 17024 bytes
font_01_sfnt_off0000feb9.bin
701ec55cfa1e288a8f74e3d497e4aab7992cc2f8c4c9601ab91d36555ddcf389
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 11056 bytes
font_02_sfnt_off0001184d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 16792 bytes