Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d837c8a90eac0ea…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 06:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6206f252a0edee397ae6781ddf39a365 SHA-1: 15d78e31a40b82da629708e9b8f75c00c18ae2e5 SHA-256: 5d837c8a90eac0ea185bdc371ebfaf235dcd86ef49b2301f48e89ac58a1f99e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sn30g113irse40448be1ronep9/jomevate.pdf In PDF document text
    • http://rowadhr.com/app/webroot/upload/files/68231208957.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161326276509b3---xovikuvapesatuzidez.pdfIn PDF document text
    • https://pokereshop.cz/data/file/towenixodotagepajegow.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/48726118780.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/suvewenon.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/199f4092cb7257d31dbd806b592dd0b1/meluwexik.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/92021622258.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jufepuxavu.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/vabuwisol.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/96973699775.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/gulexan.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/15518925584.pdfIn PDF document text
    • http://findusafranchise.com/files/files/dofesapunupu.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/35188236461.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/47107262554.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/edcc7a9957c0268084fcb57e52522aec/719350920.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2416274a---vowomugom.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/zawit.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/54643122081.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/wajilosejixuz.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xanigofopir.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed8cc315d---88234025750.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/1142506487.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/pukufamaxasej.pdfIn PDF document text
    • https://menu2uplus.com/images/file/posigavegu.pdfIn PDF document text
    • http://belloverde.net/emailer/file/jumewinadiwukuvezovukuweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=font+changing+app+for+androidPDF 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_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 17516 bytes
SHA-256: 2b3250eafdff3715209b2e11b3c2c3985bed1ccc94e6ae3ca43f97a699de045d
font_02_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 10528 bytes
SHA-256: d9b46541beecf22d12574ade973cf5070b532641f91fb707bc62bfe84a9a6203

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