Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad34d2d393ef1a0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 20:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6bfa83a1959c71344235b6f3daf58c6f SHA-1: 5d9c50832499d0b3acdba7a0f5cd70e8e0fa1339 SHA-256: 6ad34d2d393ef1a06f183367881204885a558df3d923708fc5c523cc2617271f
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=manual+de+instalacion+impresora+epson+l395 PDF link annotation
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/75369425252.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/32lepi9v3mcttangp5u0dc93mi/viminexo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd5b3a29a---87611198072.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a5147cf5---76603265198.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/16266014360e774439d2fe.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ml6hgdsva9tkbb1g1tjucmickq/gitelanexokasogumolub.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/httt6100aab9klhka8ghf4t4q0/81003568294.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/82952039341.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/xabenimavojolujexed.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/caf0d2019ca3690b45e95a0df0d4cfb0/kanodisefifefutolo.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/7890602243.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/lixekovop.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/861c42e4d405578cd65f229b3d3147d0/torulilutusesasugopiduzop.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94734a6fc---zozolorezixewidifaxurala.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/125815645.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/97014251157.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/28589118411.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cvkpe64lr1e9tbtl2o0ltblti5/49794907111.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb3d37ae35---zebilepumakixikurusojepu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/njbjcs78ofnegg1bsmuu00l013/riwalemijis.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/s8lsopjsmdmdi2fre3punlpe42/34430641537.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2853348e---mebadesekakolekereven.pdfIn PDF document text
    • http://africareview.in/userfiles/file/libatinoveru.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/99688391170.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4724302339f210fe7f483dab3ca1b3f3/68222220048.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16288 bytes
SHA-256: 85ebea6b8d84c166cdc984481274e8995313d90c4e35b6b85c2bab32162f6361
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 11244 bytes
SHA-256: d86d3bc159c4edecec3947396a8e6048102debb31dc4fea4c30b83846bd5201a

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