Malicious PDF — malware analysis report

Static analysis result for SHA-256 62081f1ddfbc63dd…

MALICIOUS

PDF

78.2 KB Created: 2021-08-07 07:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ef6e220334ab704978466e5d3a63749 SHA-1: 4a27c6055d585c3d77fdf2f868f7e340cac87a5c SHA-256: 62081f1ddfbc63dde992015e509ec322e610c1f17b5bba6af5d8188ea0c441ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dentalclinicbangalore.com/uploads/42917541842.pdf In PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/bemobim.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/83088362976.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/4211223450.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2ea8a3b03e219021ee7d317e0bac9bbf/33181491647.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/sawefepovuligurojuli.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/kemivegoterifuku.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ced2bd7525f6e56dc2eb2f6157f4f318/sejanupe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/th2v676hbrfhi88kv9h7qp7uud/86759617065.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/kutenosuninivi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/da1a7cdce953253958b27a9061e9c830/23954291893.pdfIn PDF document text
    • http://santeh.md/img/files/zevotizibafexalaguzefudo.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ae4dac776881bae440c0617d54e3a000/mimobinukorepugim.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ceaf29b1e---tuzitebinuwiwej.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/35973283214.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/65800776748.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/roldak23ulegloc9ivavt27p5p/tixemos.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/sepixuxafekipelit.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/bigoji.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c72fee158a3---widedusukorarinuvotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bachelorette+party+itinerary+template+free+downloadPDF 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_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 16728 bytes
SHA-256: 891bb1446ce12e45d3c274061c74596166b02764b4ffcf20f612ae41d85aaefe
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10968 bytes
SHA-256: 34d3ea6a16788f7db0a6ded01aa8f33f4e41b701d15eb895f1373486c75c8f08
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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