Malicious PDF — malware analysis report

Static analysis result for SHA-256 b318b19ccc29654f…

MALICIOUS

PDF

62.4 KB Created: 2021-06-23 01:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0ad2619c24a1f29f0dcc4434d5e73044 SHA-1: 659ae65d4aeb6dd7000c688dec9145201f83926d SHA-256: b318b19ccc29654f08a6961bf3656f7fb1e7c0a130da7e60cbab0f5591e5415d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, aligning with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc770cd47---kizezeloriwomeruro.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c43b37360f4961a821fe9b6c00b65bd8/vexonasojik.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ffce50241d1da25b5c18bc5e7c4d925c/97892690071.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/zamorenovawe.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/rusagawogufebapileriji.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823bb5b7201---61566819701.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/vinidonenufu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5d2f17aafc54885cfd55f0eb587fb7e8/rigesajinululadu.pdfIn PDF document text
    • http://benetalent.com/upload/files/xelozikobu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210623024410_xp8hug.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70gr0hbq7j75gmekfvd9qhnpf/xilapigaxi.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/1u36esehpsjgkjgkl68fnb956s/1515739974.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gajizeginum.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbd31bf04---5829356995.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/78m4qaa2ik05mqgortvjogf674/64698936365.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/tezopekefetijifopozo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/76111364891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=layla+perez+massagePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67E 5232 bytes
SHA-256: 5e57f257edf6f9fe534894dc554fc7d5295f913885c30f31d30cd65cb0ff1c12
font_01_sfnt_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 10852 bytes
SHA-256: 8e72b3bd181f87c86f47cc623487b483d0dc3fa136a1e27242ee71c860f8af24