Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28e4331eafc9c18…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 17:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbb2f01ff7ce009bd24d22e403cecccf SHA-1: abb79bd000c6365f17ac74c4d93d9a079bd85ec4 SHA-256: c28e4331eafc9c183e0f9df3f68b88d5b0be20087c2dbd7fcf4c780e29b8ba60
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to evade gateway security. Multiple URLs are present, some pointing to potentially compromised CMS uploads, further supporting a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://shesob.com/file/files/miboranazek.pdf In PDF document text
    • https://gangnampools.com/contents/files/ronosafojilakik.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/faganotufuvoxetajovogita.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/wipulidujur.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3480d7eba6c94a1ef3133530070e4c10/75011411062.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/nojigi.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/85439598998.pdfIn PDF document text
    • http://ore-processing.ru/d/files/kokexaxolol.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/85999998620.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/valopiwopinadiw.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/13302877077.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613818bf07ac8---52280598533.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/32247d23dec6ccffc76a85e665b77ac1/tebabalopibawu.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/mekilegoxurivima.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/89305048123.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/99072325056.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/52724563440.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/54750619532.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/lazefularodizejosibokib.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/dadofuxiburelolutakosum.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/14597519309.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/24178971990.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/45730680468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+underground+android+downloadPDF 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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 16956 bytes
SHA-256: 4c0e71193692cbeaff8b66b98d3e4a002b82b68c3d375b6d81571dd845b4eedf
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 10480 bytes
SHA-256: 05204889697815c70d13ac7923a8f792f0140dd55b070c976730f519273fd239

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