Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee933ef117f3c74…

MALICIOUS

PDF

83.9 KB Created: 2021-06-10 15:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e2de4ef765d4ce394af3623b2a7e85f7 SHA-1: a3d91dfd1775393bada904ef9db1534d683b1682 SHA-256: 9ee933ef117f3c74f976878a312aef84fd47029dc5a19566207b41244281681f
164 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 links to external resources, many hosted on compromised or disposable domains, suggesting it functions as a link farm to facilitate the download of further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://pistant.ru/uplcv?utm_term=pr%25C3%25BCfungstraining+goethe+zertifikat+b2+cornelsen+l%25C3%25B6sungen+pdf PDF link annotation
    • https://noithatkuongthinh.com/uploads/files/14301262325.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/f79m75l4e2i112046p6l2rknq2/86813529030.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/26160473845.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/45sa1qnv7ajpalvraig172l0k6/37122714680.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee28736d3763b780082cbf6cead96ab6/60322775570.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2307aca79e51a3f4cace611c85bf7086/65390894169.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/71372714768.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/melomexesikexinera.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/33053041039.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607db085008e8---poxivomuvit.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/41828720952.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ur73pb4s0ubcdvfojhjp8fsjvp/2561886502.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/80632850473.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0b378fd1---kefutiboposokipad.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621690492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mediaget.com/userfiles/files/bupamotofumujetoxegunukud.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://scripts.sil.org/OFLIn 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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 6064 bytes
SHA-256: 60f36e30242901cfe89440ea60d55902343b53d7842fcff0d8996983bd70b390
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 12216 bytes
SHA-256: 5e975be4da1f1aa68eea67bdb0c027d42d3b2f450277f1d0fe06374a7fde0afe
font_02_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 17004 bytes
SHA-256: ae5db5e6b351cd71636ecea616931ded39973ddb9a063e65e56a568b6dcfc33a

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