Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d7d73626c1ea21…

MALICIOUS

PDF

94.7 KB Created: 2021-09-03 04:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1403a4a4569ad4754d54707e506e857 SHA-1: c2214a728913c79e72b4719cd58273b04e2c76c1 SHA-256: f6d7d73626c1ea21700d9beebdb6e1e1f32f67022e659c4898ac39340c468bc1
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a7b882655---68317464983.pdf In PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f89d78740784dc35669b5c9b239dfe5b/96821892633.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/zunupadojetijivadupi.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/18280070144.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/39559769728.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210511120937278353adg1mh.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/pupinirotewejazedotit.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fe789ff2e20ad3b1494b986fff2e3704/11943022439.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/57358049868.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/952857718b99a1db68b8a43b69c76c4f/tajekutaripalo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i7v8crkglpi410ehp0m74gnqc5/2329782115.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/tizusofuliguwobivez.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/benipawinawivinojafu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/3612668672.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9987ac66fb68c2bd3bfa82a8aa40e117/surebidibopasufuwix.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/41250015805.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/mipediwaferujonotoguzow.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/808125369.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/tn8hsc038hve4rd3n1e0e31t2s/vezaludumurumavepoko.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e642c0c2b---63599561090.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/71021456164.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/gifinojonozorasafuz.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/pudaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cuentos+cortos+para+ni%C3%B1os+de+preescolar+ilustrados+pdfPDF 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_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10952 bytes
SHA-256: 864802686798b35e01eb8834029f46849dafb0de1e91d1b788488bf09b1b7942
font_01_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 19864 bytes
SHA-256: 5e49ca01f432580f2ff5a12fbdf08f25dab284a0b76f46eebd1f83859382d8e8
font_02_sfnt_off000151ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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