Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9977d1491f1beb…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 10:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c97b1db9785685ab34d48bdce4f413ae SHA-1: f4d086e7abaab886a39ef20a1a8d3880286a4c74 SHA-256: 8f9977d1491f1beb2cabd7eda3b92cb3cbeac4e23ea0ea1b7f553093a7eaf8e6
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the idea that the document is intended to lure users into downloading something malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synfarm.com/upload/files/dolegugawegukosagazegu.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/nafik.pdfIn PDF document text
    • http://newcityhk.com/userfiles/fixerolosu.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/79370802204.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/nudenavuwoneze.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sejafi.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/9799790070.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25d363e87---83132523969.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161361e92bea52---vovunisiwudune.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/xopojajemafopejig.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/6263078748.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/01bf2f0016036e57b30abb5416e145de/12901077306.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/26083511264.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/jozegavugeniwip.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b76d3eb80a---49679333035.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/zepovo.pdfIn PDF document text
    • http://mutitar.com/user_img/files/76459485617.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9ca4ab24---guvopelozofa.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/57836418456.pdfIn PDF document text
    • https://pcetravel.com/files/file/44458927789.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/piluwipa.pdfIn PDF document text
    • https://value.ae/userfiles/file/58994175477.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/ripome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=i+found+love+bebe+winans+lyricsPDF 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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 16560 bytes
SHA-256: a651c27cb4b66750aa90af3ee2d6e6a3f411d5429cb8b883d7891c0c781c7fb3
font_02_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 10828 bytes
SHA-256: 265d2a67b7fafb5d031cb2af62695fedd9e6b4253976e793b4c4f5d5a64d20e9

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