Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5312e8be29421a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 04:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9498645fec725919368e4976a0969534 SHA-1: 1ca0fff751ef6ce3b0143acd7e0adba2af5c15df SHA-256: bd5312e8be29421a1267e0787d8fa3b02aac42d8f141f37544aea9adb0af9a66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sameiroeventos.pt/ficheiros/felalidufan.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/am8kh4dletnjdq8qnuru53kal1/86284189774.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/rizijakolizej.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/d04s7un57h9rfvtkdd3fr4d5p5/55067600106.pdfIn PDF document text
    • http://szcftz.com/upload/zekevipafebixed.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/7390909012.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rudopizawawilarubom.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba450ea571---pujazuwutiponow.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/7056532367.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kulawopepubikuloninub.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/43372473302.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/64044042335.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/duvizemumofaxutamajipuka.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c4047738---refonefelonixob.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/bokeb.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/pozipunetunopivem.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/73441769491.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/49126110934.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0e0a234c64b09e4da304f12775bb8b06/77071122404.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/gaxuto.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/44516740216.pdfIn PDF document text
    • http://wohingltd.com/userfiles/45163745929.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47443996448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=location+manager+get+current+locationPDF 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_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 10460 bytes
SHA-256: c21a8ccb2129862fcf3b48cb2824f3ed2ea84be21eade5c8571fe037712d8ed4
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 17036 bytes
SHA-256: cc27f273a5085ea5b2af12b5c96e579a64d3dcdc8b610ba4a252a72af4a91aca
font_02_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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