Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc4db4a74de1f0d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 18:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 595f2195f59f5c850f822291fead4adf SHA-1: 3897ba9bc1880167c7716b24148bcb3f25f7d3a8 SHA-256: cdc4db4a74de1f0d3473d9d2459b2cf3979d7dcccaa6e20f7bfc2f805bc4c585
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.agcontraincendios.es//ckfinder/userfiles/files/61354112039.pdf In PDF document text
    • http://rasmesafar.net/basefile/basefiles/xuwovezonawekiforubatomo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c08c523745864ae3cc4cb2471f8357d3/tuzadaxonukemomatod.pdfIn PDF document text
    • http://techbis.pl/files/file/bubijil.pdfIn PDF document text
    • http://chinazzjx.com/d/files/46660070324.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/92282901972.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f634d24d051bdbd24b53921ae88f44fb/81763934695.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777460f5f5---3250759577.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/91924635026.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/zogevoxadarolujatizubo.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/81219331250.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ffrp5e3kmain1b07nqnv7m1kgd/93073752834.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/43886601202.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/21e7b9ed0f8c3a5b5a673358889c6e0d/13176193858.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc9279bc2---73581056301.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168cf5d99e3---kisamuwatevetim.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a0656166---bizenopefamagatuxevu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/22593040547.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/fc5678a1456f8fee905f682edf71724e/gememafofobekaxikepupaw.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/36de3510a5e7634777a2c13de583360f/xujatujozifiga.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jatusapefivevagolixojem.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hdikitsguu9rr4tcdt2hcsp6s4/wisajitapimaxutoxuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=finite+element+method+pdf+jntukPDF 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_off0000be9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9A 16624 bytes
SHA-256: e8f2323274f7976347af73e8b09985fc9707419aa7ee1c9db9f62fa286e5d7e2
font_01_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 10632 bytes
SHA-256: f34ed6ab6347dba5f6235ec87d692d7a90f01288a1ba416dd62fa069f3a6f905
font_02_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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