Malicious PDF — malware analysis report

Static analysis result for SHA-256 c966c0f338cc645d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-28 01:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d05f445a90b13578f2c39241f03c551 SHA-1: cde2a6b17fc01ab6926737466506bf43bd8cbb46 SHA-256: c966c0f338cc645d9d8eee17a0bc5a4ed4071a57fe41d9aed72e3530f1d69399
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms points towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b020411ce---72516455963.pdf In PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/fedijilaratifido.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/vemomudebejadu.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/68700260100.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5d31d6d2568cbf513456a2dc35fc2af6/30914800015.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/81202a9f83fb8f1dbc2755aad5ec9a76/52669904446.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/supedozigevek.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/30278990221.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zagofutevininivirub.pdfIn PDF document text
    • http://rilta.net/userfiles/files/tuwoxozetaximoforirinaz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8b1623de---gavuranubasitifep.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aff281af4---dovirenoxukafedodav.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/41173535856.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba26b737d58---levogazez.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/jukevemajarixoziz.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/28824564187.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/duzeke.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/febiwelekeg.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/popatipem.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/vetarome.pdfIn PDF document text
    • https://masukpt1.com/contents//files/82985971283.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/taxusigi.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210717_7DBB8EFBA42A2310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=como+hacer+autos+con+cajas+de+carton+para+ni%C3%B1osPDF 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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 17892 bytes
SHA-256: 405840de5d7f5417164f2343c32b598d4d3a1b050cbac8dab3436ce7d00d3eb9
font_01_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 11200 bytes
SHA-256: 64e240156c26c53430c7bb7222e764949dc2c4177775e0b831861f2dc77ebe35
font_02_sfnt_off000132ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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