Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6ba4989ad88ed8…

MALICIOUS

PDF

90.1 KB Created: 2021-08-10 10:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 246b4adaaa8d79409f791506b379a8ca SHA-1: 1ac26b0a5306ba28a06d3c1aff19a6ecb806cc6b SHA-256: 2c6ba4989ad88ed8518b44473d0a40027be10b668106ea5ff44c3b040e137181
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fba49f64ee8a0c48c1a47def7d9cf2d1/biwiremigijodem.pdf In PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/63330952033.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111cdbe198ab---55895985895.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9ab622a568574c8b5e4898cab178c8db/tilukimebutibi.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/wobebalevofudatogatuga.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/37266853982.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/88312810161.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/ftr9hjoknjndfdmbnogilknfv2/vunurovope.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fafd1cba4---jugulobavojuwenususomidu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/12814325700.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf1af59d429875631af92390f3965c5b/pisezuluvaxewefefa.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/vepoxunivisuperexezuba.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/12527396680.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0efa05627f---nuzoputudife.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/55520976331.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/lugem.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/xofodarapapapukidiruz.pdfIn PDF document text
    • http://15889163.com/ckupload/files/taleretukewidepolox.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nnint84f3ppb0a4m4bkojuvm51/wuzawolavumemaladilolomem.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/muwufudo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/cb9jdhg8edgapfi3s8gk0e7hi8/70136902356.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/77459440022.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/gozixol.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/jojakezofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=south+full+hd+movies+2021PDF 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_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10788 bytes
SHA-256: def01487e140bc0b17615d239f31067e8704ee442a5ff4868cbd1e9604f9db5b
font_01_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 17372 bytes
SHA-256: de70e841a7cba0de2c8c40068010f2d1bd605d3bd8698f8f6938d7189ae17ed1