Malicious PDF — malware analysis report

Static analysis result for SHA-256 7419e6253a943f0d…

MALICIOUS

PDF

90.2 KB Created: 2021-09-23 20:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e8a3ef3e02f546ab7396375705960dc SHA-1: 8cfe682e6b464e629e83f7224f803e98b15b3efa SHA-256: 7419e6253a943f0d313a51ff4985bd9ab750325c4c997b34d67415f8b0c58e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://eastmanllc.com/ckfinder/userfiles/files/bidiji.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-1/20210901210432244408.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/xopipizegozirobeminejixaw.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d99643369---97714467213.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kavoretatuvikepetezobebis.pdfIn PDF document text
    • http://prompol.com/media/file/79480096333.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/torunotemorijinaxuzexejip.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/83199821586.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/koajv7ko6doo53m4mv03pbrct3/kuxige.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/53943746903.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/dujefuk.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/6930278939.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/11733648345.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/panemux.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/3654722535.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/satikurul.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/nizebukurifuj.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/24572009157.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1d17b022---53240384053.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/piwobidovixotodemojero.pdfIn PDF document text
    • http://htygroup.com/upload/files/kotelavitis.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/21999888858.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce53e7072---rawetiniritixo.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/69240544352.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/9213701104.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/60596763667.pdfIn PDF document text
    • https://icbacademy.com/upload/files/66430274707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=knowing+full+movie+free+watchPDF 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_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 10856 bytes
SHA-256: d779ede56f7b87b733aedf461a9a87f3e37cfe4fac1ae0958da8f7ae80f3354b
font_01_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 17596 bytes
SHA-256: 443fa0239b3f3cbf9da4bc471eb7f3c2d5e6e9bfb01f12c1a6c0238235d09393
font_02_sfnt_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1