Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ac117ec4e7d757…

MALICIOUS

PDF

89.6 KB Created: 2021-08-09 08:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 81e58726ea3e5b40aab371a25af49d7a SHA-1: e7006ffe0c175c78b194f71eaa4321ec16c592b3 SHA-256: d6ac117ec4e7d75764dd586c269696b3a24b3e98c4a278b235680368ebb8873c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The URLs are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://allytemp.ru/uplcv?utm_term=how+to+use+dragonframe PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6669eed---71238936239.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2e582122663d4d1c57ce074bfa143eaa/tegovawegolu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d667f4e4094---17379428842.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/xisufipunonu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/2695575031.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/15357543899.pdfIn PDF document text
    • https://anfauglir.com/images/file/1279360260.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f50b6a825c71e18f1fce96a7c0e04a3/puvokeseledofemujerixijid.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0c14eb8929ef30f37b0e93f790438b70/59204588906.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/wapeki.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf9476757---xalog.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/52473178508.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c148c6dc932---kinesenekaxopetula.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdc9f365f---leniredezoxefi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p9orikuvj23sc2rqk7hhi8i84u/77774494429.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88783035638.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e2f1072c506ff44f723e921019850f66/34533758064.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bumuvijewuxizazowavi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/foxifolomelugitixu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/73529437520.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c5ac9d40452c6811f5503c5e0dea2e6f/8189769085.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/sivuxek.pdfIn PDF document text
    • 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_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 17236 bytes
SHA-256: 2ca8352df15487e194e20f46b7e3a99e9d2d51e5d9ac18e78af4fdc7761ef9c7
font_01_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 10736 bytes
SHA-256: b175e888a4fab515ea25831c67c77fb26a5458459a9abe2d926aa3206c28c76f
font_02_sfnt_off00013e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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