Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c4160373afbe4d…

MALICIOUS

PDF

88.6 KB Created: 2021-10-17 10:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 23031aff4288a71f7ee3a9852a4c93df SHA-1: 3296f3f15a1b73d391f1c0d08233413dd193a178 SHA-256: a4c4160373afbe4d702cadc8ac2d30f2f09a3ac9f91fbf237156c226fe701a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of external URIs and link farms indicates an attempt to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=atomic+power+of+prayer+by+dr+cindy PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463ddaaed0---8615295346.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/faxobuderavaxajibop.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/49044297722.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/lalalevalagiperalil.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/pezalufigan.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/20960241977.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/58805824824.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/velidubabexubuno.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/75102026297.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/patojakawikatul.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/65336324640.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/194f5218d0bb9568fde6a1e0db1365db/tuketonapomegov.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/59917637680.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cd1e881fd0a7c6b0ee84e41c527a68ba/91931460414.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16169b6a745c6d---3425979667.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20211013190215.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/64503230567.pdfIn PDF document text
    • http://nfc.soo.jp/file/nopirosorebozefereverugu.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/potamalatev.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/57276810908.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/77167507723.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/39781157822.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091208002725.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e0f1c9f8---45433841253.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/86329701767.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/fotefosijene.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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10888 bytes
SHA-256: 40d97dd18f846424f0183c90d10e5ee86e39f764196006fb14b09d8bfbc381f5
font_01_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 18096 bytes
SHA-256: 59945859d84241959487934b23f10110a25a09c234fadc0f636af8db0043049e
font_02_sfnt_off00013cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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