Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1a6803e2dc90a7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 16:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a61ffa2ce156905a28b7b8d68b5f68ae SHA-1: 1dac886b863df5cb98eb4854ddfc872f7c9830d7 SHA-256: ae1a6803e2dc90a72c6033adb0ef67b417a2d0bddfd52d8f5ad4a80f7e7c24e7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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://medvor.ru/uplcv?utm_term=raya+and+the+last+dragon+filme+online PDF link annotation
    • https://triptoboloyfoundation.org/editorsfiles/files/mekijezeveto.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/duzimexodogikateguvimi.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/10375376598.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7946c14b5064e6e696edcc5dc47a6810/wopowuximopoma.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb6525fc7---53983337862.pdfIn PDF document text
    • http://friulanapanini.com/images/file/bonalojudopizu.pdfIn PDF document text
    • http://dps-bayside.com/uploadfile/editor/file/20210920194925128.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210923010457188.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/30673128098.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/momowebuxedobuge.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/tateji.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/mudikipujabawejizutez.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/51618144492.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/3561100688.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613776ff93b42---zujawonoganubed.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/55872733234.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/budadujonataxatovoxifolez.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/76753812953.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91169d2f0---firizuxi.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/30262526481.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/tadadetodadabit.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/rojabirebojexome.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/loxitugofutaj.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_off0000b45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45D 10960 bytes
SHA-256: 42d4359e4dde0691c2dadf6d833b1091ffeb0216c5069703a6bf6abe764bf67a
font_01_sfnt_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 17528 bytes
SHA-256: 5fa551a16eb00fca9cb4a1f1cc612f7a1568565a4f26384e2c59d946d31495da

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