Malicious PDF — malware analysis report

Static analysis result for SHA-256 376666f2a42d4cd8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 02:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90f3229f0ae0e5fd2238bdb5a36166ae SHA-1: 0b3110917dbba2e775ae01e083a709a64e0d1b27 SHA-256: 376666f2a42d4cd85180cf7aee47c1f9f9b60ebf30226dcf7d2216caa47d382d
124 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues about its intent beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ladymamashop.com/uploads/files/202109151649284439.pdf In PDF document text
    • https://gelblighting.com/userfiles/files/polerosilanesesulip.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/83046270581.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/62453317346.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4873f212---11815146886.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/9055541193.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/kaxatutazuzagasujofipireg.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/xugagakawizifufakezewad.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/32249984149.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_9258D07CF09181FA.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xedigow.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/71386956425.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/divobodigonubutolavug.pdfIn PDF document text
    • http://mq-water.net/upload/duguxisabolaxewufozodij.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/122e34dfd3ade89f2805ad75e9b98670/vikerowabamugoposozo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4f62a5bb---mufadovezunojixa.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/liwuzu.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/janataxajetojinekusiwinun.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/topudujes.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vegutuzexurijijifikituz.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/50143211297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=qr+code+brave+valtryek+v6PDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 18012 bytes
SHA-256: a9ef46f94ad46d94bcee63c3b3f1cfb8be858d7e421350fea508213992754ac7
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 10640 bytes
SHA-256: ee5d0076d46ba2e405af49a134ad259929d6b978851232b1eea0272809013b27

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