Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebce4c435719153c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 03:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4f07d7787c3cb7e5e26c75bf6290285 SHA-1: 92fc46acd9f7b6b99c22be12edc86137c9edebb3 SHA-256: ebce4c435719153cf079589003c5afaaafe6e9827118807b1836d6a6e9d986c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0ef82a50f13b4613b331e30b0d562d6e/tasitelinaruwupabowizenut.pdf In PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/5828691194.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021071011343180554.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/58233289765.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210629_28B7F182C79FFF8B.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/wezezolatafajamupiresok.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/4333280130.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/62073021275.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fef045cb733---69847053002.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/34909143409.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/leruruvozexazetakoned.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160add1749ea12---bopuxisepozabimotunuzixiv.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/80507625346.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/pewirumovefu.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/noxolewiz.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553b2ada68---lifurofonajonux.pdfIn PDF document text
    • https://777mto.com/contents//files/53124307541.pdfIn PDF document text
    • https://proxus.nl/file/28348637520.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/luberar.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ef8e0482f667abe1456ff10f40618716/69755704451.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c882f3ee503---kizegigifed.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610625f60a805---dopowubi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/39483c8567e1b61d9cf1b43d563d7c9c/96853388637.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c22f7b040---maxifogipasuvirofo.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/mevokolivomi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c7df628c2f74502293315497e26f427d/tetonotukakojerig.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430085719660153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=science+grade+9+teacher%27s+guide+pdf+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_off0000ca63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA63 17048 bytes
SHA-256: e2346e8b368037d4aa3097e7121b16051347e0d6398d98e7711f469c44db1fac
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 11364 bytes
SHA-256: 05018e8d9345c452656c86330e817846c482ccc371be216e0b61d602be6258a3
font_02_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.