Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24f0d74d18c96f2…

MALICIOUS

PDF

89.3 KB Created: 2021-07-20 05:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a993da1a7c52286a12c3710cdfe70635 SHA-1: ae5d563fc4181b8f577cdabdfd44b101d9e16a84 SHA-256: b24f0d74d18c96f2a6861705dada73bff8b71aa5f46e55fb68cd5ba0ffc15213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cc89823196f72766698b8729a53dfecb/81098179419.pdf In PDF document text
    • https://ijp2.com/contents//files/nenozukuxulot.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/76137965719.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/53948811761.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/biziwim.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160823409b9226---zerisomapebanusu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/72884799673.pdfIn PDF document text
    • http://www.toptehnik.si/images/13897773813.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/55463353124.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/19311659157.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7082c2bc---99627227579.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e100918d260---40574757739.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/72410777160.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/8a82rr69efjmie2d481m5pefur/mabifogagizirodow.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ce633636db---tevebodonilesap.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/nobumumigelasesa.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8d66b6e4a33a74ffa16bd2d9aec804c0/zotirawuteduxem.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/48547825469.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/20953389541.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a12101531---79359276440.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703a090646e---dekodomimamubimuno.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab915a0326c---nibin.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/varemax.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/75451704486.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b110f76f09---vimipijipozuvebivonitudup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=midnight+without+a+moon+summaryPDF 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_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 17532 bytes
SHA-256: da466a2ef6e234f8d08635e5806f1aeb89555e19e08bbfc15cc8506a723652fc
font_01_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 10808 bytes
SHA-256: 8ddf5fb40a1d5491ad5b808d4786fa3dffe182ac2425a606ee4ba197ab23b662
font_02_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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