Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cfa0831270920e…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 08:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 161998dc53c361efa2ac4b6d4a2cab39 SHA-1: 617d08834de8865207406620796bfe944dea775f SHA-256: c6cfa0831270920e86cffee576c7515d30f13d96e5dec9a9eb2a923fc2ed4b06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of external URIs and a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lexuspolymers.com/assets/ckfinder/userfiles/files/48769124020.pdf In PDF document text
    • http://aktifithalat.com/resimlerfiles/vifak.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/92864098889.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/36145877299.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/5508783950.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/94276849727.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/71933715721.pdfIn PDF document text
    • http://mobitransjogja.com/files/23072569756.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/bafivokojavatubazuv.pdfIn PDF document text
    • https://fasaac.org/temp/files/govikimabowoxon.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/vle6noii1ns8t3bb4fgf3h9j6n/15164054017.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109052017493550.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2888c5463---zuredosurajifavas.pdfIn PDF document text
    • http://ranchobg.com/img/file/89180558585.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/44528324200.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/nudozeruleposivod.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/23570817907.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/44420007298.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/73ec2469fa043e39d919136a66dda157/57066586561.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/52915560297.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210909_78EF91DC5AA9E2E8.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/38705067067.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/38187743812.pdfIn PDF document text
    • https://jagominum.com/contents/files/55444234784.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/5028727652.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/jaborazizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aesthetic+theme+for+androidPDF 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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 10676 bytes
SHA-256: 4da524c5c5fedffb6480155d95dd7b45ab508665ec5bc07610812b6a7f1b2706
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 21780 bytes
SHA-256: 7b50139adf845d9dcf13461c40b9b4db711610bd435c61055dd819c1c017d886

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