Malicious PDF — malware analysis report

Static analysis result for SHA-256 90664a5d7760ce17…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 00:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea948a5918b463d424f450ac9a00a679 SHA-1: 556444c1d19176231121c6f98708a755b6c07b42 SHA-256: 90664a5d7760ce17eedabb7d71037bd526fb5b65e56b82bb2a7c5bbe4c7cfc31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://wastran.ru/uplcv?utm_term=video+into+gif+android PDF link annotation
    • http://vektorma.ru/uploads/assets/file/nagajurobijob.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/zaremabesiruluvoji.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/35773933081.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/57988455822.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/29029651952.pdfIn PDF document text
    • http://nut-shell.net/upload/files/kibuxiz.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/vomopuvibifamiladefofa.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e319d22dd---31130789551.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4f65e68414213dc015b33d6741042ecc/99671036176.pdfIn PDF document text
    • https://renetravel.ro/images/files/37769187909.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0738df1c9---95367043424.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0c7e5d93---nexiwibinakujivaz.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140083a7210b---sibeku.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/97278713907.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/rapukunijatadanonowijew.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/wumozixifopojolujowatowa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c9eca34a0be45a45de2b8b97c46a0425/63054522486.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8a60ffd8---setetezulogivatigol.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/18465581539.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/gutux.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfa2b645c---pifuximet.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/36741159751.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/kumovuwujatagetavid.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109070944438101.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1184d40a9---47831428997.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/zunelubig.pdfIn PDF document text
    • 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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 15760 bytes
SHA-256: 7330fbe6d8c5af333b68057b7d409f0aaad6b5e3b18cbb4f8aee401514202d41
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 10284 bytes
SHA-256: 8d97aa54a6478ad297b48986327ddb8f22b189354c17f3021b039c78456cab51
font_02_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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