Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913425d7b7a4051…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 12:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce5763c33f270cecfa99ea9f6dcfee96 SHA-1: 66bbae201ae565fd3b7cde7aa9c065bca6ecae11 SHA-256: c913425d7b7a40513797da7c5012aef3d65e4b72a4c7f4e3fce6b119e43c6519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=photoshop+save+multiple+images+as+pdf PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161255da2408c4---2882881437.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/sebakavapixar.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/41110792941.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/98851406126.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb5d0ed52---wegezaw.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf64c9cd28---kebixadatefo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121cfb9ded97---sejamoza.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ka45ueadtpgjd2curbatef77d5/foferijeforawokosenilazit.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/loguponumib.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xinisuv.pdfIn PDF document text
    • http://land89.com/ckupload/files/guwazurowapowudimi.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/59411071749.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9eb55a992b263f0756690fbfc58a1a3c/70821459792.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/liridel.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bexepagusamitox.pdfIn PDF document text
    • https://majubesar.org/contents/files/kekabulufaxifegi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/16328561446.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ca190acd---jorifujalatib.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/62697424513.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121902abaf7f---75016978557.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/6875ae2d0c7cfc7c478cc7eca50d0070/53426747726.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b12cd151---fadabekixamuxi.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/63765875295.pdfIn PDF document text
    • http://dentistturkey.com/image/files/dusifupejawivajinoz.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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 10908 bytes
SHA-256: a897f6bafbe358c8e642fd359702359ecbf305496765e27fbf5b931316d33676
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 17932 bytes
SHA-256: 98afb41114b89ab61a20f4ee4ccb0e5cc263a567c9786154ff99e577eeb8ceaa
font_02_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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