Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d6d8ca0c08cd5d…

MALICIOUS

PDF

128.2 KB Created: 2021-07-25 22:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a417a34669bdbc0c03a31f0c6e2bd43f SHA-1: 83b10a3dec7fc4ba41d87adb15834c06392a2942 SHA-256: c2d6d8ca0c08cd5d1b6c80e142a664ad54d1ec652d2162dc40404d0cee083af2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which host PDF files, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm on compromised CMS upload storage indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://alarmy-kamery24.pl/userfiles/file/vijogusix.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/37a30008668e65628a8cf701adf4bce2/22914549617.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/rasazoluv.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/13704766385.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/698471518.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jvjuago6l9qf594l2rsp366dcf516o45/xevakitopuxosiron.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/walumedaralererukedejogeg.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/rapotisewazofukopix.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/85221088e55d305a1ea66f493269e88c/5469131911.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/09cadf27609e08361cae14ec1ad03692/7602352229.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/vurezepapido.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/7ce4282b5e71e220dfba2b0d06b14a88/gewomexadubo.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/76755549314.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec97743e6d6---dininepusofirapusufekixo.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/62249460363.pdfIn PDF document text
    • http://fotossc.pl/_files/file/tobiranalipovena.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1515c842d2c921ff4a8854ed562dcfb/81231200976.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a362edc51e2---16668503957.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071835ddc443---68880650678.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/bomeligozabapuj.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/5711826536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=x+force+keygen+adobe+cc+2015PDF 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_off00018030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19842 29720 bytes
SHA-256: 7f76fa627a6fdece8484e533f626c99be96fb68eb24b56b4f7c9811c57cf0f4b
font_02_sfnt_off0001d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D655 11028 bytes
SHA-256: 7689b6e4a73ecc6c96c941313d90230d731402637880ec0646cd780f6b6d8553

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