Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b20c39cde743618…

MALICIOUS

PDF

92.2 KB Created: 2021-10-05 19:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9aaa32d05aacf217c7270843174cbaf5 SHA-1: 289b02e98408d115dd00e734642422173200713b SHA-256: 5b20c39cde743618f80f7c362eca37c819bc2726fa813e321d56a54a7c39faa1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141343f05bc5---36064944648.pdf In PDF document text
    • https://aglogistics-bo.net/userfiles/file/77765827256.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o4vtacgppdg8eo28eir9nbu9f4/81713876023.pdfIn PDF document text
    • https://motecx.com/images/file/kodobibis.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/jafig.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/71700457623.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/jisipolutubimoxu.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/29074195819.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/tuwakenutopesokodetonafa.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/92519582975.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/wovozoga.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/91665537971.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mejukanuxuzezirivu.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/gapufawuxomavub.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/33890198134.pdfIn PDF document text
    • http://ipublicity.cz/data/file/91599538472.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/gebaduzapofitakes.pdfIn PDF document text
    • http://tyextractor.com/d/files/9142681000.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/2323776825.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/putopalulujojobawebev.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/bixeputob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/33305921275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cricket+07+for+windows+7PDF 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_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 10640 bytes
SHA-256: 04ca8ea6eaa5fae0938c4b49e201933ae1e166a8b640a760f6a1910523178a80
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 19820 bytes
SHA-256: 74979ef2b952529216f702734a04dcb52f1af80457269408d298c3db7ca4e996
font_02_sfnt_off00014967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1