Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6baa84b479424e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 23:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04094edf9584f71a87cd910c931a984d SHA-1: e3fa7da80dce1fab03e932fd7440f7833cc34f67 SHA-256: ad6baa84b479424e1c96c5ed94ec221efb38d2e4cb4910c5f83b44e50a7a2f11
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites 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. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/16957500d3feff7fbefebf107cd0b345/finitunapakejawubujugal.pdf In PDF document text
    • https://invest.pl/userfiles/file/51161273398.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/xusifiwazulula.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/be44dbd9fcba9fac31d4ec8e5960aada/duxojumumufitewasasu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210630205007_v2a728.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607435cc398ad---tivufoforegimap.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/42067495550.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608507d6cbab4---jozavi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6gm3iqs9eis7o0hg2178m3u92n/51152688255.pdfIn PDF document text
    • https://marosme.ro/hirek/file/18005826635.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3202ecbffe070f9192e775107a3a5479/17641348632.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/hkjfqpl8dq32rpr9m9ppb4r376/54531703468.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/papitezabaragupefipakoj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/971bf58d7b2e07583133401892ca2f33/5004421510.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/858f1f3b4a3613560ba3a1a0436b975a/jusibe.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/libarojiwupawoza.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/pirurevasogigo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161042dc591782---44990905266.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/liokgka4i54e1flvei0eg2eiet/maxofa.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ec82de20---zivosolenevititonen.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/refefu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144b49efad---waropesepamupoxe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5cf56d50d4e5ec45b42c750b47912e63/wodolis.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/vuleso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=analog+and+digital+instruments+pdfPDF 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_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 16332 bytes
SHA-256: 27290cb48d7dce965ef768e3a8f4e343a1e554e74bf31bbee4b44bd88cfad318
font_02_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10924 bytes
SHA-256: 110051f21b5db17d08a19fcb7cbc885e28c399a369e9ed863d39e211023a292d

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