Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2bef022f342259…

MALICIOUS

PDF

96.8 KB Created: 2021-07-16 15:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 402bb2798cc698bad4af43fde11e3bdd SHA-1: 98d0768020dd77470a63ea61065cd4f23cd73698 SHA-256: aa2bef022f342259bc13fbc37c028504526a65522a4e477e50973f1b78e9ff94
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ricarda-allegra.de/userfiles/file/puvabasutudumavunonov.pdf In PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/81377514650.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/wasezaxata.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d90bde2e9bf---54438800168.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6f3f5248869c700b9b3e736a99b58d45/logulozevux.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/benepeputegabi.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/niputovizelajeriwo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7a999e4c---34041139337.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210708_7FFDC243B8956AAE.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/44707197961.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0bec96ff---78555610594.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2543fba1---getonowalaxogabumigoxadu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2482f770---69983245471.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b5866a706623a1f9c64918df0ae44f68/noxewifusuvazavaxupila.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a3ce62e7---99266480921.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/be808c12122e82db5f2e737c9cbebce8/86080030909.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/dorhv7lgcthe761j7icg18eik3/berosesomubafonimetowuxu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2ecf47d3096b9e9fc0e8be0cff816339/10726594511.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb994996a74---60026712436.pdfIn PDF document text
    • http://jkohut.pl/file/vorewudajepegesotolab.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/75678472057.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af85cf31759---gixurexamexojuvapujatexi.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/zodagoxozeru.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8c4dd8e6a9cd6aa4342b8137ac11d5a3/tijijelubajadoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+bloons+td+6PDF 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_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 10272 bytes
SHA-256: dd57ffb8a42401b7a2a509c3b7ccaeaae488f7ea964f89b05d24d17ee0786250
font_01_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001462a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462A 18216 bytes
SHA-256: ae408ed186e15873070770dc69154556cf6aaadab303411846967d746992e7d9

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