Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c6aab727c9886b…

MALICIOUS

PDF

91.2 KB Created: 2021-09-24 09:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 239c44de7e92101c300cbcdafa983ba9 SHA-1: a36e65f6f19fa0894c0a8f9b43d710e44f0d3a43 SHA-256: 91c6aab727c9886bf8f16dbb97b081c63d1f70c4f03f160612b967aa9e16f8aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://solis.altrodesign.eu/ckfinder/userfiles/files/vukulajozisor.pdf In PDF document text
    • http://cdmvt.cz/sites/default/files/nasojameza.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejizuv.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/sovupa.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/1621089926.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614caedc357fb---78087478556.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/folusozavonuvikozetig.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/51004702851.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/vobatuwojaxekufevun.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9b2b6894104b640cb97b608e4b364a72/82202989486.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/35386946108.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/mojiwaxavivozudomerawila.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aa57684cfd9f7e69b88d88a759391ba0/17738348318.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/sinerixupofozada.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jebadoxigikivimovoj.pdfIn PDF document text
    • http://rooptex.com/uploads/sibetutepoleguzofijewaji.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/winimuvegejufag.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f7d3b6fce67276889c0b297c9577d947/72960595911.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/zonofoma.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/luxewiraki.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fitatasokovibekogamifamir.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/13245183945.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614279b79750e---89540968548.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58f77db3c---45455491725.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/62158730842.pdfIn PDF document text
    • http://gaudi.tw/upload/files/sijolaxafotub.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0fcb01824eb8f655e72e5eafc4754de/32496176159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=aot+wings+of+freedom+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 24248 bytes
SHA-256: adc2e3dc10fc19316709ae69d8bbf61b7c9f17a0dd8709c5fa1802e25d19c484
font_03_sfnt_off00014602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14602 10720 bytes
SHA-256: 68c94266290255b8cfb39e1c7f7f4dfc7097d375a49a6556fa94fc9416fb740b