Malicious PDF — malware analysis report

Static analysis result for SHA-256 63536a759a93a24b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 16:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1dac2521ed8a9c01ea8cea2acfac942 SHA-1: 3ec4107eb3f2ef036ac63683a5738d93d1638bf0 SHA-256: 63536a759a93a24bf47fec798522bc08aa4eb469e3f9f9d2fe438746d57372e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of multiple external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://incense888.com/uploads/files/202109060647574658.pdf In PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/bidusan.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/55532594037.pdfIn PDF document text
    • http://klinok-saintp.ru/files/36152221091.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/37433389808.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/69559312582.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272f5371b1---rozudavegigafatuluf.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613113f24d58f---nupojapupubalebozutozezo.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7ad2148b---korojujiwu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/40026422435.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba4ce229b---risujatolixomavupulinidof.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/71087672295.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161371885eafe6---leguvikatenavodezidibimed.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/28070282838.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/89953936271.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/sikorul.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccdd40c9a---56209926920.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/52879473509.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/bokowagajakenabari.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5k82hvop4cbqn36j1joi97vgf4/26712995574.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gigoboji.pdfIn PDF document text
    • http://www.grifin.sk/files/kenemidalizedikivokiwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ymusic+ios+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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10372 bytes
SHA-256: 87451d3310f2401f4d25ca34cff974e67a6ffdded137e5c04d2ef604c673a7e9
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 17600 bytes
SHA-256: 1a5ef737e7f386aabb72a396080731093f5b0579e138b515634566b5c66195ac
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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