Malicious PDF — malware analysis report

Static analysis result for SHA-256 03335dc9817cc39f…

MALICIOUS

PDF

93.8 KB Created: 2021-07-30 02:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 203d9635e899248cfdf7548597f1024c SHA-1: 996f1025c704f21728b9e947f9d401aaafe7e8e7 SHA-256: 03335dc9817cc39fc00b11316e6e010a2c45aa72c450f68e408443c8eefbaccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a significant number of external links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://totounited.com/contents//files/kopub.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5a984ec17937096d42520f6053bcbd81/wizivunujepabaf.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b16bed35722---58869048629.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/dujizirebavowe.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b09b1e8e---nurakisedemujorupera.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fe153bb67---jukabizetotajemadusipajod.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/51903183666.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc9a171b0fbb6ac400447feea585abbe/44302362521.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/a5hulo22lbh3bbli0n20m103kr/puxamifobavefakefenovixot.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160765dfd23d4d---bujujutun.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b890021c0---61908115671.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdfce405f3a9aa0dea62c9ae9de7001c/ronolijalubatokosabitowek.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/genaselopivagebatoronaz.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/durilolapojadefomosonaw.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a0b3b403---xuselurukijopol.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6440bf51---wijojiwizaruzumox.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f4d5e0764eb8f3757b91b710aa5f0adf/bisudimot.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mi50f7ithin2hi6c8ogivgl17/24490391229.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ks4qoodu28m5hr8ml20p4nqlg6/daxaregemizibifaraviku.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbbfe1213e---fekawuxopaxevuxobuwifagun.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/folupimopuponepanuwik.pdfIn PDF document text
    • http://df-foundry.net/d/files/bisojubes.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/13990013750.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846f5a63185---81318602786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vampire+the+masquerade+v5+core+book+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_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 11384 bytes
SHA-256: 70690155d5854b64369dd1c77fff6e5c9018480ebeff36ab171b0b1ecd69af4b
font_01_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 18744 bytes
SHA-256: 3aaa8e7ef71213e8d8bec2dfa5549440ab4daa6e593b1b841b6a12e2a0740977
font_02_sfnt_off00014f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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