Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad4fff15ddcbed6…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 16:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0f0ea69a66082eb42bdb1373bcf739e SHA-1: 579f11a87c4bbb5ef8db99e0b3d8db2620359ebf SHA-256: 0ad4fff15ddcbed6bf5b4c2f822ccfd6127a1c9e7167f99c9dc9ce2ef6f14194
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02da4722bf---10987321746.pdf In PDF document text
    • http://czdashan.cn/uploadfile/file/2021050208032873499.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/5587189215.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b2ae3582---57457299045.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb6377033---marofogawelusutopubimepuf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/21b4a8802fba28bb15510100f2242d40/92206463059.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3213262f---nutave.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/bizidutipesatawanajukivaz.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497dba961a---kepifut.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/45489330527.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c9da5ae084900f875af6606a08ca6126/74974497350.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/31994622866.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/nidaberimofufozegizujug.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/wemejaxegozelakasufeb.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af641c20277---71368227980.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210620022758955.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b662ec30d4---27227150812.pdfIn PDF document text
    • http://lbassicurazioni.it/file/21761466619.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186230ac9e---nutut.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/56929957433.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7ca9ce09---vanokipozegezodobixegel.pdfIn PDF document text
    • http://zxsolar.com/d/files/dileronikon.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kf4h0v56515mu3887e2asdkf9a/57002522871.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6rb6035ug0f1k419mvuutreegc/fofazeruvodivofaziwuzuw.pdfIn PDF document text
    • https://ancoraeducacion.com/images/82708638433.pdfIn PDF document text
    • https://promise-land.com/upload/file/xupeleletixenabimozat.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9128195ce5---lusagejen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=angry+birds+transformers+apk+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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 17376 bytes
SHA-256: 444a5f7fe57ab26228c20c0409a77b15f7cb9287b01662379b46239044e475a2
font_01_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 11252 bytes
SHA-256: f2c743f98ca07c981445cec7416de0ac91eaf109023f136a3a5f79b03b2521e2
font_02_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1