Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c6ecd67e68bf44…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 14:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0304ae32383e6acf7f28cb8b48a1b42a SHA-1: b9d9e18c44051732de60517bb72c34635d04f427 SHA-256: 03c6ecd67e68bf442b438bc136e632ba02ba3e90d2429e1af53b66fa3d2c4769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sdes.in/uploads/22143708856.pdf In PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/78dc1ec149eb08b61522b3f1d0b548b8/78634156697.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b5b120c80f5b5322e6eb87f22010cd77/rofasojanave.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f47ec59e9c4a1c04d3accc20d8f690d7/41116968397.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d34a70db13339b4ac637f43d027ede52/pavisuwukebuzamigovag.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/webobumew.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n35ggfkno41hc4ng0163gpattk/73366915860.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/51132712345.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/37542975231.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/aj72j17hn3cpg0ajqj9naldk1b/59368089439.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c0f12e49d096d2d5d3b505c2aca44d6a/nuvamuluxakexogig.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/49461759942.pdfIn PDF document text
    • https://chp-travel.ir/data/file/69755259980.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fc1254---35224869023.pdfIn PDF document text
    • http://funperm.ru/content/file/22031190416.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c0ab59a5---19561831594.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/29601847620.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620559151.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/ebc5bddfccfd2808d08901b90537cfeb/6771087887.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xaxoxinobomobowil.pdfIn PDF document text
    • https://basisnomor.com/contents//files/96161501074.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/47154657785.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/95194887399.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tabukokolavifekoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+worksheets+conjunctions+grade+6PDF 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_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 18188 bytes
SHA-256: b56ed4f8db1853bf152dc92af832720f0b58b22e6e7f76b422de9d98bd470968
font_01_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 11156 bytes
SHA-256: f9f5403b6fb6bc847ea36a9cdb638bcafb50eaba618ea45502a31ded71c93548

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