Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bef350321edf16…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 03:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 17ecd8b3a56ead7abdcbc422e537155b SHA-1: 01d9290be7a5d0185e6c2746c1bf0ca0608d382e SHA-256: 40bef350321edf165099c5dcc19013cefe2dd7e4a4aa8d646cc035c671f71016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of disposable hosting and compromised CMS upload directories for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://aihyang.com/userfiles/file/39032522146.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/d2et4gdtmh5icrea0j4u85h5pd/wigekapuwujirisavuvisifav.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/xobesasamopugulozuwepap.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/debosarikikuxoduxubog.pdfIn PDF document text
    • http://berbun.com/user_img/file/31985496969.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/16653320924.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/rozapurosujotimoda.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/htl839cd5fg5e4qjhfcianalo2/30739118641.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/rodobazutifovowusilosipaw.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/53258921528.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/80599771062.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c586c7778---90209872213.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/7a22e5993fa36b87e0e7535f7e5e026b/nogeganuxopijagemo.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/78179977925.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8933a9ec---zeliledurupubifekogeve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a205877d88a---36438151577.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f449a2154cc459064f1d948ee2735e06/37431294027.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/aa4a0562e95bfcc0f736229360f2457e/96448173954.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb7f3f048---seligisazovinujazopafe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6le6bekmhqhpe4as3jjdc0nte1/vobobenefelegibovavuz.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/52149778849.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/napavifilipulipivuwa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmp3gfi5d9gekqlcfd50lduq2m/nepoxonokezato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sickle+cell+anemia+blood+cellsPDF 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_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 17152 bytes
SHA-256: 9499eca5a3e27ead15052b2e290ece7e3100f2b918a019814a7904646b5c8654
font_02_sfnt_off00014c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C83 10640 bytes
SHA-256: cccb17256dfc5eef533833440bac9895563c1e6747384437772fef847dd45740

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