Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1db904993860b96…

MALICIOUS

PDF

93.6 KB Created: 2021-07-17 12:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5167930b967aab5f35a19bfe3b5a5dd2 SHA-1: 09adef192ae9fa64b633de6f8da503c701154afb SHA-256: e1db904993860b96cb28b9af4ec3f899f7737b1a040d6d251ccc19e0e0c0cfa9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/lebojufogosivin.pdf In PDF document text
    • http://kolaykanal.com/userfiles/files/60100063822.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca544bd2c---62878147560.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/girixipegorirefegewufi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4a114ffc3883175ef4095b405d1a4410/95628154057.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210710115458580.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1f573ecd8f5b75d6ad0d5731c64fcae7/muzoradudibakekuraj.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/89563271826.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2f6023e802a7ef72b89429c5ce0ea2d2/65232834091.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1593597409.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vevatejoweribakegepaw.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19839ca5bda0e28292e30699068e3dc6/lobikimikanadubakoj.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/33041646311.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210510/210510185546423261s0mj2luavhba.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kckvrg58l8uslr0u522a0chhi0/28047988792.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9582cfb72---50008159093.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01d829f849---20416177942.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/11561848696.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/61316547393.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/38312691000.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d5dd529a---75763110875.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/99397599133.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c17726f0c---zidodewikonumaxewisopu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d0bb4e9258878de960a2bd8f7133534d/91472458864.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a73768ea0cf---jexiriwet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=digital+marketing+strategy+for+real+estate+pdfPDF 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_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 16848 bytes
SHA-256: cc69c84a08c0099b12aeb82ae0145a7f935b6fadb5f3a63f9746b3ce482cd5b5
font_01_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 11048 bytes
SHA-256: f149b171d5b5ec3ae754890326542892fa82dc66dc7b08f22a9b25677f681552
font_02_sfnt_off000150ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1