Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ef7440e153244b…

MALICIOUS

PDF

84.2 KB Created: 2021-07-08 04:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f87e7c4799d553ee322b402b4177590 SHA-1: 5a6647bfe4a1d7dc242f5ad9d806c18bcc09cf62 SHA-256: 22ef7440e153244baf57d1cdccb88d2fa57b47b021d1bd191bcfdafa112d7655
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV also detecting it as a phishing trojan. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=pdf+to+word+without+changing+font PDF link annotation
    • https://cristalparkhotel.com/ckfinder/userfiles/files/gukopodinamepapusa.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/f306f5v3vcvltl48nha8u8qb7j/24252346515.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/eee1b8e40353f236d7e57496a38d3465/lewaduvuperavavare.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210704071716.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/17b9b7dd16140e28cabf0b10e035592e/jesepukegaradu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a3c6fd96d344fea5394af728f5ef8b1/71070513323.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/92662016042.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/79faee3f8b83dd0a297906ed3705cef6/zijimaxixux.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160795ee4b58cb---midefofuzifolow.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/kumilome.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ce661a2306f---45564198738.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/fofugura.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc00d3f3a1---5917714637.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/mudifizewoxegir.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e072d1d27215dcdecb7fdb2b8637fefc/20225368247.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/kivanidafejipowijeloke.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdd40a204d8196fc65716a9ff16b56f8/76448349715.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/50083eb6a07c4779b5f4d47d0be04a97/2944108492.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ktg84mda6if85b23hg5qfvspqs/80814669215.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/kezajexebijimixa.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/63145365892.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/16929825989.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ccde6b444c9c936bdb685ccb430d7f36/57173702856.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b4f3c8a7---kitimufan.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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 16632 bytes
SHA-256: 590c54173b91e06f5a2eebacacc5e70da8441b3157709c133d35bc2cd581d5ee
font_01_sfnt_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 10596 bytes
SHA-256: e1930f10bf77dbe43fea79f9a8c0d099228b260dbc0596f2202525e07698f70d