Malicious PDF — malware analysis report

Static analysis result for SHA-256 20de0b5ac9ffaee5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6fc2205d773cbce6cdefc9d7422dbc1b SHA-1: a49d3b3c650bf2c44b68782abfb476b0ddc04287 SHA-256: 20de0b5ac9ffaee583266aec8380cbf7b9077ec0c30c26d0b059fba2b55ed7db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://hotnews.md/upload/userfiles/files/nowozokexiv.pdf In PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ahl2blf14itmh30d801i8pge6/momobo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d349ecffa6---23586770089.pdfIn PDF document text
    • https://kopari.hu/files/file/kolowewufolabipiguvulu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/suxevovepakisij.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/memonakofura.pdfIn PDF document text
    • http://teraval.cz/res/file/muzibababusefopekimosaw.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2df237110---nidazigowito.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/gozunovukuse.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b16c9031---61068556958.pdfIn PDF document text
    • https://cartolmania.it/file/fosadime.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e8d337c8b9994bf4b0823f14ad41e29f/vurinebaparibabobanez.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609809179caa7---57288724734.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/60d3c3f4ba772bdf796e8080f71832d0/kixukujedujipokijema.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b678767894---60127337394.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diguwamevipujituwere.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210728_766950B428290DA1.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/95218083043.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/wotugobiridigufif.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///jabebobu.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/4072175298.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a51567bc37666e36c69426e60fb5ce96/pomagafalikeribafidizi.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052308474022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ayushman+bharat+yojana+pdf+listPDF 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_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 11096 bytes
SHA-256: ba2bbcf3dc220378e974b1574b5356e64757add1694d74d979ab3bdf1471bf43
font_01_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 21256 bytes
SHA-256: fced18d0db384b9b054bd870414bdb8911297965b1a5b7d528aada80b2388941
font_03_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1