Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acc21685aade983…

MALICIOUS

PDF

91.7 KB Created: 2021-08-10 01:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a96fc987586b94f8b6a9d7a270436ab SHA-1: 4a623eaa31ed7e475a2cfec252dd2e196f588f37 SHA-256: 3acc21685aade983c228a7d51ff0a6836c5ba449d8f4bd807d7d48f61029578c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pistant.ru/uplcv?utm_term=produce+101+temporada+1+sub+espa%C3%B1ol+cap+6 PDF link annotation
    • http://elitvorota.ru/f/file/85244785767.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/eda0c48883ea8072c98368d263d124ed/10794169981.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160829ba8794bb---15909673588.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/73909534453.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/71888254935.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/metewikexor.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/43199354767.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/43674281068.pdfIn PDF document text
    • https://loctra.net/userfiles/file/rulajumowekezaxivumexut.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/genakofudizibuliragenonar.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/94944466288.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f744fac3471---84038364808.pdfIn PDF document text
    • http://usmleworkout.com/files/file/79806558022.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/lafutojisavukufejawep.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tqe0ko2k12m4hbsrtembrkvi8o/linifabejemojowutaluga.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f963e0d2---jatiz.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/jesiropifemifukuwu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/69237106917.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/mapivumijupitenilik.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/nupusamemonavibule.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nuranonikokabuj.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/napegowepexa.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e566e407f---41938272595.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 11268 bytes
SHA-256: 5f8f59496088260158f1a1d0707c135b818cd4249a6fcf2bdb4cf46237bd4aeb
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 2044 bytes
SHA-256: 166647e4ca206401be642208a6cc3c1b45afdf5a5cda68b4cdff825ff866586a
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 18344 bytes
SHA-256: 37e2ae1b34ec09608df5242852f2ceedc23c88401771ae45f1e4117714177cb5
font_03_sfnt_off000145fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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