Malicious PDF — malware analysis report

Static analysis result for SHA-256 577faeb2761366db…

MALICIOUS

PDF

129.2 KB Created: 2021-10-05 12:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58e70dca40b826686e5869b393a5f8e6 SHA-1: 41e2611791c753f194930807992e8ebaef27a2af SHA-256: 577faeb2761366db77a46870a804380207318841d8391a1167a5e467568dbcf2
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=concepts+of+physics+hc+verma+vol+2+pdf+free+download PDF link annotation
    • http://teranor.com/ckfinder/userfiles/files/83830423193.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/713003fa70c12d0c499a36fb87e4c22d/54918300492.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/89938769623.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rh23tr183omvr68i6ga6rj1qi7/39001127648.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/tobozopevopibop.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/69911898965.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/9930083964.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210926035928.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bavobolike.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/zonelisigefedo.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/22692540364.pdfIn PDF document text
    • http://e-menu.hu/editor_up/87228735183.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/23457494290.pdfIn PDF document text
    • http://protezas.lt/i/File/telilit.pdfIn PDF document text
    • https://penzion-palice.cz/content/gavisevowebozenit.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/wefamonoreduku.pdfIn PDF document text
    • http://dd-eng.com/files/files/kusugobelumode.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89807562ad82f34cc5471db0e174441d/fubivelavabujukumoxadota.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/namimulafujolu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dc38c0b42b546ffb25c52cf59a5ce39f/60214815053.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/94795720096.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/27251403862.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/97244979854.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_off00018992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18992 11304 bytes
SHA-256: 9d99ee9f872cf67baa43b264af0976b7b14643840f6e6cd7a9cf53c397b1a2c7
font_01_sfnt_off0001a415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A415 23412 bytes
SHA-256: 091df368649b2add915976f3dee6fe1c4995b1e117d0427419661afc846453bc
font_02_sfnt_off0001de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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