Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ec07ee7d36d37…

MALICIOUS

PDF

90.6 KB Created: 2021-07-22 21:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8716e092c735397f046e24830b34cc5a SHA-1: 070f1025efd715f7d9d365e2bdf9965f2a918e1f SHA-256: b66ec07ee7d36d379b5ec341aed06dcf58c73762e5765f2f85f617082674a251
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/90ebaa4951bc9bf423da4756841ba07e/zumazifop.pdf In PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/84439258504.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wefepegifalabusapixixa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b741b07e---jonotawovaniz.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d40c7044b42bda6a222122d308ccf2e0/tamaditu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ff161e72---77848254922.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b230b2bf6---zevudotafivalonovegekuf.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/vusewepazuxeniw.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1095d3ad17---gifikigiwutunori.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/48531497111.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089853f863ec---77087694179.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/39552896292.pdfIn PDF document text
    • http://bscartridge.com/pic/joxakupibosadudelas.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/tewunalitesuvej.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/luzawe.pdfIn PDF document text
    • http://fabtur.ru/upload/files/36600052651.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210604_2E967A967C5AD572.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hqp66gkfpgba7mp7mjg3h5jd0t/62302674350.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/80795826754.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e10019957---26849566088.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/lerameduzidutuzagusem.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a24f0861f---jegolanatuzobosexaritabe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607607186b2b8---26905422012.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc15c3647---kerataseguxufuliwavufub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=top+grossing+films+everPDF 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_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 19944 bytes
SHA-256: 44a321b07725a717f7f127f824dffe021abb196ea9e5c63612f0d53268b2524e
font_01_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B8 10468 bytes
SHA-256: 46e948da2adc53756e0bc21c8fdbd46641a8deceeb59437f4a68db0f891cbb14

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