Malicious PDF — malware analysis report

Static analysis result for SHA-256 4505bfbe0d534a30…

MALICIOUS

PDF

79.4 KB Created: 2021-07-16 08:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2105c7864bed2c63a8c463282f6c3b63 SHA-1: 94603462af6201eea6f3d0d5c45fb2583906ae78 SHA-256: 4505bfbe0d534a30cb6a099f44545d6acee01f007a152e5ba829cab083eeedfb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://vandientuchinhhang.com/upload/files/43966842682.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4124ab197d---mokek.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3766d054bfe340397c21f233df0b8224/76294096882.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/81737934325.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3ac48565---38042475972.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/73661233639.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/nebaxaseluxa.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3760532e69---85458878538.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aab03bb4a5a---wimuzefezegojotujij.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8f8616391a7357d12e5c2b7e608868e3/madebebotaj.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ce8b6db9feba26561ec4169462a6341b/gemiwewatobixogeg.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/14028819191.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c23db5970---36311292580.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/mobujapukigo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lovisi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608374735984a---wiximin.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882fd85648---20494616315.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/016ecdc9de31e7cad6cb44a3b6a46b38/sukerogamigebiw.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/48263584865.pdfIn PDF document text
    • https://emprenderem.cl/files/49949293214.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/a4dpqnf719btc5s117fe9lv8n5/13820613704.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/58280404431.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/729855cbd3681bac671a4954b8b7b707/nabaxedadida.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64207451819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=m+tech+crossbow+accessoriesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 1824 bytes
SHA-256: 035a3b7e956f25d6e208bb90e6916583eb82ef7d705ccb9823d5d2a4ad59470f
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 10396 bytes
SHA-256: 17b909efcedb60438a5c73c0888fef057e8719b5330cd677067a5f2f34505f74
font_02_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 17676 bytes
SHA-256: a44c64618456e51c84070726139a0e095a1062c840bcda15a46d0d31d01dcac1
font_03_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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