Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c55b91e04157c48…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 04:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a24cc24da1c925c3527598c765445f8 SHA-1: 3b5abcf942a4f4d695a012819be3a2228c9fc83f SHA-256: 2c55b91e04157c4851136e18a0fccd7f4501366981d219115376da5c918914ee
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pumarecovery.com/userfiles/files/risigapodo.pdf In PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jebedikoxakosimagekopitu.pdfIn PDF document text
    • https://promise-land.com/upload/file/wetoriv.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3a7d68de1c55ccf583fd47e3ad8c6a89/zukisibowedanasuru.pdfIn PDF document text
    • http://atek-ent.com/upload/file/86742682461.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/femigunasudadoneg.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc5ebd593---fufilakuvoxidisimo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076580f5e706---vudamukotamovowunesurod.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0c7a138bf1496ad1dfec46e5f871d055/rivukejapunudopopugituso.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/86519485971.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/repunovofovilojumowi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0c12a93606c17c3b557cc57d3edccd45/gamek.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073126a431fc---87373367488.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/89274233392.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a5246c64b---30551433133.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/pofopuguxeponiva.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/vuzane.pdfIn PDF document text
    • http://scro.ru/pic/file/wobiv.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/75155549590.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/91019381908.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea5fc4184---33582226550.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/titavorigulogivutatopel.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/fujumojevure.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/566e0b0f5a87d91ee1fcfcf118f83f41/fiziporud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=flixotide+spray+bula+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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 10820 bytes
SHA-256: 1efd0f9e9f6113a78b1f77173c364b337b56c23a8329e9b675462c01a63e506c
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 17984 bytes
SHA-256: 02a78f0cd741bee530588f20b769fa41a47cee225d01e3abca075ca8ee3574b4
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.