Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6266b8f56340b6…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 09:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c798b23ca1447716ee79bd91971814b8 SHA-1: a3ffe27490c20b471251c75bdd49f808f2177edd SHA-256: bf6266b8f56340b6cd5e96e514db4c03dc5b5e1607dd80c6fa4e7ac6783feb23
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document structure and numerous external links suggest it's designed to exploit user trust and direct them to malicious payloads hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55a349c9ef---42688226026.pdf In PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/93170227139.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098881d81b7a---mepetalof.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/viwekasa.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5679eabd---55613131336.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d625c9b26d8---pazodotanameverakusulivel.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/39820504868.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-13/20210613072541577542.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c016e5e22---sijeb.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/63995754843.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aebb145d6---dimodometitobefotisopek.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607250534a52a---ribawava.pdfIn PDF document text
    • http://fygl.net/uploads/file/151510001662.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/86219572502.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc459e8bc---14797953975.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/denifonozusigovanezisebur.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/50a1d27bd2fc58f49dec581197b5b19f/94413803963.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfec27aa50---tuzumazarim.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/jcv2uk3pb4jmjro0605ptnlhoc/42278047246.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210615171952.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/51sh2ebethttf12bi89sifc8v1/76881979332.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/98b703fc33120c3a71a1bd672e18a266/vereb.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/98271097756.pdfIn PDF document text
    • https://chp-travel.ir/data/file/biralapamesimopotiwuzib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=inheritors+of+the+earthPDF 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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10216 bytes
SHA-256: 3a8d9fcc8808eab8dec1092e8fbef57ec73c1fa8a3fb8f6a50eedda8d879c64e
font_02_sfnt_off00011956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 17296 bytes
SHA-256: 2dd9b4299c0d67d2e00904ee49c3693bed96f425ada74882bd2535f6dde0a626

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