Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaedcd16e17d18d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 08:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee221a5960e3bb408098b297ff62b210 SHA-1: ecf95c7af5e489f34b1f30f7722add45352f5624 SHA-256: dcaedcd16e17d18d77f932fe32687c6739ce56ab9d451b69b03445d11252ad57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://asztromiskolc.hu/ckfinder/userfiles/files/85351318345.pdf In PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/lovodukabagaxim.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c327e5b2---21386317788.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e9e6b2c0719e9b307f100395b295d2a5/12242152467.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/nekopeferarebojolunedavi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/467469e9215d8a47c5a45f2f41416e9a/56747267231.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/28088280861.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/40877744241.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8bb4uurhr9hqapdetq48he5b80/zelejipepugo.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/3628850002.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161336f84618b9---44052216827.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/kibisa.pdfIn PDF document text
    • https://invest.pl/userfiles/file/wowegomizololoporavido.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609836cee6876---46024362801.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/jabexidewozupibel.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/54943722614.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf05f88f6b---49077391236.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rijodutenubovabudufuri.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/bivogelisuwemelowoxa.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/75147956908.pdfIn PDF document text
    • http://olympusflights.com/files/files/33965790515.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edc5c991f---nitag.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sp2ts8nvtrqt99dmkg4k5kpsum/gizigerobavewi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608c219466401---vunesusatavamo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6982d117999646ac373190d1e90bb59d/kukog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=foxit+pdf+editor+2.2+crack+downloadPDF 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_off0000c2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FA 10888 bytes
SHA-256: e844579d9340656725530ce11ac1945a8df8b0a0dd92fe6e794bedde256a89e4
font_01_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 17208 bytes
SHA-256: d1095dda6a94b9689c395785f31c822d86286a5d6aea65ccf0d204431c5f590a