Malicious PDF — malware analysis report

Static analysis result for SHA-256 676db8beac62952b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 05:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9542685f126a628f53a2d8fbcfaca633 SHA-1: c3ca8bc96ee2c21563302d2e2a40bb345c4ccc54 SHA-256: 676db8beac62952b6dd7cf723cafe1400f00266fe7dae65290b816beb7c66f9e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The presence of numerous URLs, including those on compromised WordPress uploads and disposable hosting, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=how+to+find+iphone+is+hacked PDF link annotation
    • http://leeclinic.kr/userData/board/file/mijuvokulipemevojigaxelo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614272ab68f05---22885421660.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d1131464481497f7d79df21c03458485/73999320335.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/kilagajadewifogewoferulo.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/33741506750.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lebufevani.pdfIn PDF document text
    • http://ledins.lv/cms/file/vatekakobozuxak.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tikokipuvakikabanox.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/80353682845.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338376a2f23---favanuderudababamudat.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109090833555828.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/migizifejubunavagakomu.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/widobarizesegijaj.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/lasejazato.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/wafuzegazinedilebasa.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/5678798663.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/66759613744.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/wekekuwejubari.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/dobilanomoxomamadigizufop.pdfIn PDF document text
    • https://icbacademy.com/upload/files/54853863940.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1bc913dc---11911227667.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7af13447---dikugezajulaxerunanenud.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bepokalip.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/3166882620.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 10740 bytes
SHA-256: e8fed80491024537c8bbb682194b6bd75af4b361a465b42d935b5e01572ac119
font_02_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 15060 bytes
SHA-256: 010a0db40f325c50f03bfc7ce41f95bea582d0785202c3b70fc9f2f6a3bfda5d

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