Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b741b337541b82…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 06:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 384bd497784c020d0dbe54853013bc75 SHA-1: ca6e7d0cfd3ef16f9d4bad47143e6a36758a1113 SHA-256: 05b741b337541b8252db2e64d0f422c25b79fefe20b4366a2c7044afb13d02ce
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to domains that appear to be compromised or disposable, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://blueparadise.pl/userfiles/file/34601542376.pdf In PDF document text
    • https://33mobility.net/uploads/files/82253141172.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/22845118760.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4d5968b06692365fd5490b220b944cb4/881739226.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/xumalafewovumobijenolem.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/44113600247.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cb178a8f---pemupoxotojerulapabofug.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/kifagugilerajikeg.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a282617031---denutobatorefigimamisoged.pdfIn PDF document text
    • https://edgecs.com/documents/demujo.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/lulojebunisaxekikun.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///berunanezabe.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/tomisevoxapudovenarive.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/zejenexi.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/tezumenitise.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b88c90fa---gosunosadomula.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b7eb0c0a---fezevufi.pdfIn PDF document text
    • http://tercovci.cz/files/file/47200808036.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/zutiviximuv.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/busewiwatulovedorikedowov.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117905f30d24---3769969581.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108102123113113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=set+preview+as+default+pdf+reader+macPDF 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_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 17144 bytes
SHA-256: 4807204716e6b677a8b3215f3986c9d219258aeec564c0db263db81b2115cf5d
font_02_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 10884 bytes
SHA-256: a26dbdd5436d2fc683793ecfd091275f4460be092fef542b5189622fcb68aa71

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