Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2726dafa786ca0…

MALICIOUS

PDF

83.7 KB Created: 2021-08-23 15:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d4b9cd185593d4e595a5ca7e8a840dd SHA-1: 432e1194d15c686f42a7f4104bb54ed4258865e6 SHA-256: bc2726dafa786ca09b6c4310dcf285694f92cc890a05286af55ce70096faec6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=difference+between+one+tailed+and+two+tailed+tests PDF link annotation
    • http://www.europesolidaire.eu/userfiles/files/lupatazasutatixuj.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce58c540ad3---72236111711.pdfIn PDF document text
    • http://vo23.ru/upload/file/sowomegulalufudazi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3954577ce538726cf3348e2e3fce9c2d/beredajupexisaloxe.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/85047421828.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/20eb75ca1bfced7319ecee17517e70bc/964060216.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bc722f384---jekoximaruzenurexeno.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/suzov.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/zogunebikisilaxunog.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/d83r9hp4a3hf28lfhik6a5nbk5/ragab.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/mobikuwukutovetama.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/65834823483.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/19516347689.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715835498c7---gokorexodufuroz.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/sbuq74tv3qfhnp2i4b2tnb9dls/3021768020.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8a5ac22f---puguwosirelujupefivusokib.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/11928915737.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/wejaz.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210606223408268189484.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec9905e5fd---28870247171.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/kesediraripoz.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20218141947464472.pdfIn PDF document text
    • http://www.respond2articles.com/MEEIn 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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10696 bytes
SHA-256: 0fafa29e2b88c0ea2202504f04426cb2d59f6e5871a29ab835a99f564a1df262
font_02_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 16776 bytes
SHA-256: 957963ac438016c7588951054ad36c8361eb8f83c9eb19aa26644775c30c83b0

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