Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7402d3c0b9035d3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 12:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c61ced51f143eaff344593bda9b09e56 SHA-1: 0d8b5590d9d36dbf5d08fc8f9e8d2814688d81a6 SHA-256: b7402d3c0b9035d320633c072280835d6b9a60eda47b3630fff7cd74c19a4b8d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://challendor.com/fckeditor/upload/file/94383911578.pdf In PDF document text
    • http://topp.pl/_topp/file/wemenavidedofizi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469209031e---20724170752.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613895fe10b3b---89111325116.pdfIn PDF document text
    • http://tzsunup.com/upload/93145476061.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/sirebitari.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/daxosivufipefosiboxigol.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/51590901076.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/93846522981.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/jimovasanibafufijodowoxof.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/6076116838.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mc81vcpr1q15po87c0k9rssgbk/vugirewoxolomisik.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480de622f42---nemugowet.pdfIn PDF document text
    • http://asfalon.com/__files/file/66519363337.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/tawogubifatuge.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ee642c3f---togenazujid.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/93978972525.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/80360580211.pdfIn PDF document text
    • http://master-br.ru/img/file/48837070057.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/tafupo.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/pekupo.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/petemusakik.pdfIn PDF document text
    • https://keongracun.org/contents/files/jigoluzipafome.pdfIn PDF document text
    • http://geoman.cz/data/file/92712479469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=prince+of+persia+2008+game+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_off0000ba5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5B 16456 bytes
SHA-256: e90b5099e8dd19db85cd55cd780da6bdd737a721cd5ed65c97af3a83230c74df
font_01_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 11400 bytes
SHA-256: d87a2f77433a2a9a44ce1c28c1a23603fe0ec7095b3b361b928c85dbde9cbf6e
font_02_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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