Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad4d3b7b2a0a970…

MALICIOUS

PDF

90.9 KB Created: 2021-09-06 21:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7367923bd55e1eaaa55907604c9b67ca SHA-1: 2c34dd9411b312bbba6d3c3e6fc1c207f3f678dd SHA-256: cad4d3b7b2a0a970e32ca158836dfbb3d79fbb165c6ad069c1145d2c158760f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aravlicraft.com/cmsCart//upload/file/dezidaxatogikor.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da03d3fe14---bekavarud.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/66663001988.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///pigejokusazosinaxejuwaz.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/818952886cb2547e082284e1cf9a9670/migudi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fab8ac0c0---73617304339.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3a70984e---pusaletujimuja.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/32282318373.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wedebigez.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-29/20210829195312309719.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41604217509.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083314178610---6436724447.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/63162326682.pdfIn PDF document text
    • http://samtekelektrik.com/files/42894751538.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/87621112526.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/disewitilikegi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949f1e3261d---xalapajobekibamofofuxevaf.pdfIn PDF document text
    • https://landi-bg.com/images/file/kunifitoj.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a6a98f0310579c88913fef332fb6669e/petijozaxaroratesufotedap.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/62937522910.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/22f91940acebed2ce8d1546a38d5a5b2/tofapanuwawironuranilu.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/23616653324.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b0b9b9e00d09049e4646290b914390fd/21109526970.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/h7nbcn1cnk5lpd6dskcc5boeit/larokukituxogusugonexeb.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/17173802558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=william+shakespeare+obras+pdfPDF 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_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 20072 bytes
SHA-256: a974acbde1f68ff63cf5254ba869b2db9539c29959b77422345f8e627f1ff58b
font_02_sfnt_off0001451c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451C 10784 bytes
SHA-256: cdadba9d866ddc189f48a4ae098aa208e5de30158def92847c00ea5ff7190115