Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb48a1a86589bb2…

MALICIOUS

PDF

94.3 KB Created: 2021-09-02 04:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb0798d98a09dcca4c092d62049c97e2 SHA-1: fb1beff0a6fe8684e8e1114385b2c74ebc1131cd SHA-256: 6cb48a1a86589bb2071f1ae4b2f401d0b8ebd1a0f22712bf9e8057c4116cd7a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, many of which host PDF files. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. The presence of a download button lure further supports the phishing attempt. The document's content, though heavily obfuscated, appears to be a lure for downloading a file, likely a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bfj8rpn73vhhgj99onoiihmjib/76787526294.pdf In PDF document text
    • https://total-sport.pl/img/upload/files/lakekenulibata.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/23708950968.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/27a3b4ab16e2f14e25081143729ec632/41696620735.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210815045524_j4nkek.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zefaselerafired.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e27114e321b6a6407bdc09f1f8110b68/29659700419.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/32f5933ffff7a4d23972f189b3726ab7/79764953750.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/0221ed6ea977433b8f2eb881844dacea.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f672f903---gujowukuroxuwabanivababi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d626c37ec7---69397389482.pdfIn PDF document text
    • http://jonme.net/ckupload/files/dinas.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/majukakisevuropo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a28405e4b496d0ca3e167f5c483da34/modotozomupogopi.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210819114808382.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/fixesezabupilezezubokugif.pdfIn PDF document text
    • https://strechybenesov.cz/content/564881990.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ffb18085feb6f10265078826abe73e38/36023787297.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65396577111.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2961d93b5---laridesubarafut.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/empjpbe1k27dhsq26t04b43ps1/38480094226.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/riragotozokitegeb.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7ecb26472c3ca5baa68cd1fb64b45359/tedagisijelo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hmdo31geriqo1ab7ajis7stkm1/33733541208.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h3dc2m8fd7iclo6r26vbsdv7lk/xubuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=san+andreas+full+game+free+download+for+windows+10PDF 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_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 17192 bytes
SHA-256: 6c43fbf2fcf3e89952260a5174f48fc8afd97dcae94883808c015bb2b97ca7b6
font_02_sfnt_off0001502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 11032 bytes
SHA-256: 19e1b9e5929cd1b966282e26378b25b703335fb8caa01d297d5d23ea986cf948