Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac740ea5cf3ae66e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 23:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51bba84aeb77e1e5cf95ee18668bd342 SHA-1: c8446b928abdd3e795c84895810157a11e4279ff SHA-256: ac740ea5cf3ae66e554e71b4dccad28e49c5f531ead908358f0358b7b8a1493d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=agronomie+1+pdf PDF link annotation
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/pa5q2ist7165qrtb6n0kplu0si/12770135841.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/23715249345.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608825719dd05---34924878919.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/16437666762.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ab485bb4f.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///43381450932.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/34013447065.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6c39a197b78e8166c8fb0bf50d0a259c/97474739956.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609079c8132fc---kegixosomotexopoj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30af9b270---6731901460.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cc5118217305fde0d5628e1fad3a2b0a/bevam.pdfIn PDF document text
    • http://ipublicity.cz/data/file/tajizanitarewegifegi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ba6587ae79772be1bcae99655ef93f98/87822609327.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///27117751432.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/71860288453.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b73da9a1---13772578794.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/romolejaxi.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/lidabizozozo.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202108291553351181.pdfIn PDF document text
    • http://tencanpowder.com/d/files/dewurolidivepujarok.pdfIn PDF document text
    • https://eurotig.ro/file/76557819402.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/dexobonibiwumup.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/mozokojavopiwusa.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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 19524 bytes
SHA-256: be31159fd8f106ed01a55fdf0a639aac280581221d26c775216af83e83400421
font_02_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 10400 bytes
SHA-256: 7f052571b5ee71c52e912783116fb41c9eb2b2acb3f7cc64223a5cdfda812189

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