Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd0d3d76a844507…

MALICIOUS

PDF

86.0 KB Created: 2021-08-20 03:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bad46d04e084754fac140662b8b05bfc SHA-1: 54b09d7145bb4f28c678c0a66dd5be7860a42c44 SHA-256: 1cd0d3d76a8445075d4ef0fdba2c8e44f0691b04e1f00f58e3ba71ab0ffecb65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/31a7d35b8432c80e616e3012bb51c9d0/binixaza.pdf In PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210624_2CF5FD75275FFDAC.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/wijoximerovibumepuzekubi.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/89286317332.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/nefetoropajuxi.pdfIn PDF document text
    • http://nensi.si/upload/file/texarubodokakafivepuso.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tdqeofqiugcbh1au341djl25sj/20865667038.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8402e61242639239f33549b8446367cd/jadupakafobefeniju.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/48494961289.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c41dc0f18e1---menukibupupimamenik.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160925cd134437---79313925531.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/kewokimujogopaxomagug.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1bbe36ee8d4e5b6d32032f67551aabcd/20912618933.pdfIn PDF document text
    • http://www.puhito.hu/uploads/nujidizezer.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716abc54583---tosukejiwibuf.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160897dd270a02---dipejilubinemajimed.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/xafukakapibukude.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/af81ca2a296cca88c41e81cd93842ef1/15867273148.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/mibazatasimo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845697422e8---ziwasegedu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/68265856962.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106070320.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ordq1avkcfgof30vnlsmrkakci/supuf.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098d0f19bbb9---32245463274.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/37013869572.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9b6adac5380040af6d61283617cde180/gamif.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/24504090411.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pupinopotefojuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+load+16+gauge+porter+cablePDF 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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10864 bytes
SHA-256: 1d8292e0c4548b6985bae753aed4a73526eab32eb45dfdd53ac39e07c4996a77
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 18652 bytes
SHA-256: 932b2a0e533cc544bba5a2c406683758271ed655ee3ead2a591d5c85925bb02c