Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc88654bc9eab7b…

MALICIOUS

PDF

79.8 KB Created: 2021-08-25 15:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1c3c000550f323936120600498225ef SHA-1: 5a3270da27ffe7e756b0fecf38d0c270c5e61ccc SHA-256: 5cc88654bc9eab7b28b99cbbf98edc6da84fe24b96b5f6f5c00a55725552c1d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705e53074b3---notonagutunob.pdf In PDF document text
    • https://albawadiroad.com/userfiles/files/59694120117.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210618_215007.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/38010680042.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/34529587597.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/37075785883.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074723e5bc69---78291246123.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/4286089235.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/leviber.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d222981d3a9---80882052596.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/47972fc03bfd3c498b1f327413d82891/tavepufosevesezunoboxo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6abe3efd---44750759507.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/381fc97a9d759c0b60b1a2fa8de484a1/69075020885.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/9336237643.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/vunoditusogutezefomono.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/21553159257.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7acd381d---vomaroworevi.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/32806897734.pdfIn PDF document text
    • https://retta-bg.com/userfiles/wurazono.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/74609474510.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160721e467d234---62067105741.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/23684487492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=convert+length+width+height+to+cubic+metersPDF 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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 11080 bytes
SHA-256: 55c18d309e0888ce015b922e09b5175ed2e345f2fe6504c68f6aeee105a070f4
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 18444 bytes
SHA-256: 7cb21f313c1fe66e166165a902eac3ac67ad95da7b1a6cf2239dcc748d200f3f
font_02_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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