Malicious PDF — malware analysis report

Static analysis result for SHA-256 9729742bb2b2c2fc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 22:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b260ae076b9a63b819c16badc2f72ffc SHA-1: c3f83a3b4c1d6fa39a825f02ac84d942bb714fc2 SHA-256: 9729742bb2b2c2fc8d0491480091b1f728a7e123d3e59b98ad714f60b65ace77
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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 http://talleresjpg.es/img/file/43160319541.pdf In PDF document text
    • https://golf-tout-terrain.com/publish/page/file/soleguretadiwosevipeka.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/lofukegolezijilarep.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7676986aa4---vexulimek.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/83461528533.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/givokanepasusizijititidin.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c2818a5614c---17563781866.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a47ca7f0da6ffe2d71725c93dc0eb7f6/jigon.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/23125748701.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/miretajodawonapigax.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/lt90evocrftako9brt5qh65brj/89491339012.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/podamuzavojaxogejof.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/7j7nqn17jse71nfp9dltinca50/81798088534.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/37685143768.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/43bc114adf5cbee45f30db04f2a48bef/23245990251.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xexezubigawetemalubar.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/51753030789.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/rofojifanefazupemovax.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/bodeluno.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa457cee31e---33401382904.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/diniwetekurididiw.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/271926dfc0c32e759a278c3dd8366d39/30217599180.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/92981474925.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8167d6261c0c6bbcb1b3e853dd100a67/21855015297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ncert+solutions+for+class+7+science+chapter+15+question+answerPDF 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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 17728 bytes
SHA-256: e08104230c1fd18dbd38341c291b77f6a4ca8f515eefb9ae845761e69037caca
font_02_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 11124 bytes
SHA-256: c6ad9f49239379435fab84f53e85dbb5dc7f11291a1c061cd28ae032d2a6d48d