Malicious PDF — malware analysis report

Static analysis result for SHA-256 b423bed7992076b8…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 12:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d9568f4d8eaf0bfe6bc1c4110252241 SHA-1: a13c46de9530d2f3f0e2222b1dd832db1072f7df SHA-256: b423bed7992076b8df9abd8c4efae2cf02e55c513fca323130dc3ff558d58e47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised websites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the embedded URLs and the nature of the heuristics point towards a phishing attack that leverages external links to deliver malicious content.

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://nuocmambason.com/upload/fckimagesfile/bd95292d740976dab0320961252b0323.pdf In PDF document text
    • http://rockpapersun.com/upload_mce_image/file/witeluligaguzakep.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/fupez.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pv2g7mo09c144to9a2grbm6lgm/vizafajozefigafesidipapek.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/628uuajtlklg0vgpout78da1ie/tadisimixipa.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/34775662152.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/3351275825.pdfIn PDF document text
    • https://ptogel2.com/contents//files/nuxibo.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vizoxig.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/92986371901.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/43085272897.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/67727768216.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/78581359027.pdfIn PDF document text
    • http://ymmicro.com/files/files/32381937249.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/17364933191.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/gazifekefologat.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/o5frr6pqof2g0261bd2l4p7ugs/96035223970.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5254e13f---tanigatobu.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1627883157.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823d666b0ce---66147515601.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b96615b76---72290555742.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/nipaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=security+risk+assessment+report+templatePDF 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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10916 bytes
SHA-256: 9e003a7c68b8c27e1ed686c93a4332604caabdd2edc9f00fcfe7ef4249f154b5
font_01_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 18496 bytes
SHA-256: d3f7965c5e3b545594252fae9b3b50488f7c5492736c389e63021ca23e8ade30

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