Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62dee227021ef6b…

MALICIOUS

PDF

89.4 KB Created: 2021-07-25 13:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: af985df7bbd1c2510d49eb054bbce72e SHA-1: 07ff9885a1c31d960c8a4ef1407259944dfae1d4 SHA-256: b62dee227021ef6b1f9e4496747134f3cca0b5f385bb86f00240114f8b0b15b1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://medosojewellery.com/userfiles/files/29618389018.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/duwenuxulivuvodibiruzid.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b1609d1b---fefubimelipoxepitaj.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1db31324---guroposajugifuve.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e44e9f31---64263524210.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/94321707781.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/c4i3c9dtnbe2b6g931ferobv20/53600520202.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/dovixorov.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ecce90a7---16935628889.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cff005937---tezepisigogom.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/mefuzu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/guxijivigaluvaj.pdfIn PDF document text
    • http://nkland.org/userfiles/files/51901614714.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c195255fe30eccc78a480a68302f301f/1219786952.pdfIn PDF document text
    • http://alptw.com/images/files/titixogofu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6d0a57edc2c858adf6d79993a039f60c/noravedax.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pupalefinikorenusa.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/rulizegupumimujaxe.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c94f39bc---xifunefe.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/91816599716.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/rajuwaxoribiwotalo.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210720143805.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/wevidafovulujizemekeroj.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/68623174976.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/tumemiwusetozifanonavuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+a+curriculum+map+look+likePDF 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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 16524 bytes
SHA-256: d1fc4a9a13566aa5b2cdcc1b1167231d990eb6a8b05f1895a61d8b1cad59398a
font_01_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 10860 bytes
SHA-256: 03f6daf1a987d74eea415223325b015c6521e3adcb69affaaa5d00d889e897ad
font_02_sfnt_off00013cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1