Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cef751730f3a0f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 06:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abde0943ef8ba86514fb3fe9dfb8ce90 SHA-1: 37ccaeb7eb6a1af5cdfd109667a29684cfbae4bd SHA-256: 62cef751730f3a0f96852857efda3cf01199dac1de774e2065a5a375ae7fe52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://theipbuzz.com/images/file/gukezamilemujilodazin.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161343f21ca7b5---kijopomasakorikorawufun.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/gisamolumonub.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd2b7624d---zalodixemiwi.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/36941990873.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210905124354_tslog3.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/34525992146.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6c08a39379cde407b7d6fb18349cda5a/27177926125.pdfIn PDF document text
    • http://lachina.cn/upload/file/19945028015.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/53304886114.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/7540183930.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210921/file/borenedipotakubu.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/kegoselomegifonuf.pdfIn PDF document text
    • http://coachhouse.info/assets/file/zeximagidopajotu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/75420854248.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/65a7c74c05b13553043c95dd06cdf545/73577024334.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/82959194865.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/lesixuzexuxopuvu.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/bozofiravibirofu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/v066hisgm4dqinp7op33dsgveq/kumogomavejinawuv.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/86558163741.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/vatorugab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hay+day+offline+modPDF 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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 10252 bytes
SHA-256: 41279eaba876d28cd4ef72a127cd5dc18a37c7ecb6437db59904d81969dfddda
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 16108 bytes
SHA-256: 22b23c63bf84a1fcaf5e1f4dfb67e4b54d02431f4a32bace7ec322b83e1278df
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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