Malicious PDF — malware analysis report

Static analysis result for SHA-256 4680cfa2cb1c997d…

MALICIOUS

PDF

94.1 KB Created: 2021-07-30 00:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61a479666148fde8cfcc1d947d8f50b9 SHA-1: c4926959b328a89252fb288f7c8fd1f677486af2 SHA-256: 4680cfa2cb1c997d53d6ec80301d1374f42c805229e78ec8f644aa842b1fe640
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://vinmexindia.com/uploads/48629241545.pdf In PDF document text
    • http://aihyang.com/userfiles/file/5016910371.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/66agtjalil7hi8c41cu5fnf3ca/ledediwepibuxugubat.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609448f9f1898---82163187568.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c697e3e6361---juzakinob.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1728d2acf82078e49e74495231a28d10/nexibanegoxuxovalak.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9783978230---nawatapafazanazibo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-28/20210628140423797464.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160727075baef2---70770604698.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd42e3c7---vitovifizi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/58456478233.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/20022218449.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/xazutatupoduzivegotivuw.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/12644117203.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/weruxomiti.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/63982144002.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/78157127316.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0db2dee5---23586778013.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23479485136.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cmridmcv1a5ipiab6ra0jnud21/61169755074.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa75cb9ea23---navupuxazupovodudoxokedez.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/wisasobezepa.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/zudibolojenek.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ab2c6fe7---jitom.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2708c7f8f11cc5fda654ce9d1a6f7bbb/nazixokuruzu.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/wexawikajosojirudajoj.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/logadumanezinu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ghndc3ntokljrg189quk6hg4q2/1371533934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+are+two+layers+of+a+tropical+rainforestPDF 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_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 10772 bytes
SHA-256: b1c85fe5d65199ccffac5578d283407fdcdc2687982205c4432024728d6d4090
font_01_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 18476 bytes
SHA-256: 9a9b206241e0ff11299c8da22e55ee1265bfed680374b1e6b0fc4fa7e71d7242
font_02_sfnt_off00015210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1