Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e857af3addd91a…

MALICIOUS

PDF

98.0 KB Created: 2021-09-04 07:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3dd599c7545aca9da0888b585b69472 SHA-1: 8b9713a5ff6290fef8587ddb4de5fa80f9bed502 SHA-256: e8e857af3addd91ae2dda24a17fbc59f665ecc2d0e5615ba3c63e2ae69e6f1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of link farms hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=buddenbrook+pdf+ita PDF link annotation
    • http://armanetti.com/images/5903579457.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b7d979db6---givunugakonugedafobik.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/sejutedul.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/kuwugukolemibud.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/30493335534.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b07319400a---63137430298.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/figeralesegizadasojoz.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f186853f7e---nevarebijotixir.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/dekotusavadododonoxu.pdfIn PDF document text
    • http://placc.info/up_image/9646853004.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/nubesivemewasonakeru.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/889033860.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4cb1919613575c36bafb111cce460f78/favoxo.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/jixabekovi.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/52620382185.pdfIn PDF document text
    • http://webbuilders.com/files/file/megujanowixunekatudokam.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/domapuvepesopitar.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/lubumaponozosolovirolulox.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dba0ae74b---25840295694.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88bc5d27e---7525054131.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/79448107537.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/95941301160.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/33680035229.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/62748549060ee33f1d94ac.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/jelirirobonem.pdfIn PDF document text
    • 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_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 10664 bytes
SHA-256: 061ce43aab9b26936e4397d9faa008d2a837db7fa05c21beb507b9eb6d1ec7a1
font_01_sfnt_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001465b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465B 19980 bytes
SHA-256: fe1abda33b762757e1dc49499c3f20767e5e22f82431cf7a3f50afc4aaf85a37

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