Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd987d09d66a6098…

MALICIOUS

PDF

91.0 KB Created: 2021-08-19 00:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d500ddf79d29db21e86124a223806807 SHA-1: 0ecfefee2cd2a7f69c933922b584c6891c77af18 SHA-256: dd987d09d66a60981a4bc883ec6375a609fe0e882c0ea71c7358c8deb7bf742c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample, but the heuristic findings point to a malicious PDF designed to lead users to untrusted external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://olterus.com/contents//files/zozekugesijujigavex.pdf In PDF document text
    • http://sibinetweek.ru/userfiles/file/8165017094.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/fejitepevebekajijebura.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/83988766020.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/62245915875.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/96239c702c95d99e72e1642fa442535c/jidos.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610392428fac6---zoruwimipibavilufexaguk.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/cda1a8ece3f1eea870738058b575d905/86727063009.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/nozedise.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/785e7e6d45abd342e997ff0631cba329/88637244248.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t419rvjlairhevhq74ptgfq0aa/vobopisorimometawipogut.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc83f2443---wizigebo.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbf86177f---29624905205.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210617_7B1ECCB69024F786.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/wokenudedekivisaminof.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/povavusuvep.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/91050196444.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o2o40chvhmj364di16ejgrsbg2/musikewepop.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/98753829012.pdfIn PDF document text
    • https://raljob.com/userfiles/file/lusuronimumifo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02e452b29---pebalotufudenedadowopat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=definici%C3%B3n+de+diagn%C3%B3stico+seg%C3%BAn+autores+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 11104 bytes
SHA-256: 917b363856da9287c25485141aa2caaa4a02ee098214e813baefacd29a2a4b77
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 16692 bytes
SHA-256: eb41afe9a14b61315d1301ae78ea6129c07a8b340980b1b2a0b6527a354a97a5
font_03_sfnt_off00013f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F31 17940 bytes
SHA-256: d9839440ef153e28e9bd249e9ec95f63fb9041c6e97a9b6d97cde83bbda53737

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