Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c86a67e262c70f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 23:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4885f5d7164b38473d839e1f447f587 SHA-1: 991e60e4852f2eec70cce9e40bb0de51e69b0670 SHA-256: 31c86a67e262c70f0dbfd65d902f98b656f196a986bd724f88d3887ff9d6bd89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised or disposable domains, suggesting an attempt to distribute or redirect to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://www.zywawiara.pl/pliki/54119703970.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/45841092235.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4c346d019---76069941531.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/28779174649.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/biluvopuvifuki.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/widivebofabadused.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/69314478448.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1971228008609b1feccf86d.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/19fafad4221fa1458aa96732fd9a6382/bapibo.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/bf3f297147b83878b4df5f8c96b2d51b/donakimerexamelo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f15d7997b1f---nubam.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wupulov.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/69390910898.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ja0rbqjmc2r08k85nbbsfj5ro2/juralumomolesajegowe.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/demajematinifixomaniwa.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0347f99372---jinuvodef.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/696637a18d7fe6e2cb330ba88fd39fed/43307973492.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/dumuluge.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/ponugifewi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e43f7f4ca---mivoribuxokalo.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/54502977210.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac915962ee---jivifegubajenanavikixe.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/vatudegobijuf.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528200856.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/pudewaxorewafok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=guias+kdigo+2019+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/39237372118.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_off0000c062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 10884 bytes
SHA-256: 671f0033af6e316328f9b1e8c364ccff6a85d2da4e16ed09f35865e84235bc66
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 17152 bytes
SHA-256: 1fea3aee8e2adfa66c6b45377fe9694189961c4f3f85de798995f540091fd710

Open this report in the interactive analyzer, or submit your own file for analysis.