Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c668ad20197d28…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 10:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a978e6365acee3db836fbf7a03696942 SHA-1: d122b9e5fe86b30d927521db8b753c4d4e3fa8c2 SHA-256: 64c668ad20197d288b0b435e5416c89acefcdb83cb9c647cd343f19b09a5ddc9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document designed to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=telegram+forgot+phone+number PDF link annotation
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/64251865852.pdfIn PDF document text
    • http://zmz72.ru/files/file/vexopiveresazoximubafipud.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/6245141584.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/kazitagevigopujofidif.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64abba35439d441e25fcfee6ec316fee/83785374811.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/74761750826.pdfIn PDF document text
    • http://wwsm-us.com/files/file/zezobulixo.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/guvimoxelup.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/23288143607.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d253a2f6f9---zitadotozo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/59541323648.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/dumemitowuzokok.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gvtd9a95li0372ttjb7jdtbkvd/dujilipav.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/76674167614.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/paponerexobisovi.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/53699406650.pdfIn PDF document text
    • http://snft.ro/media/file/jidadako.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/12960565756.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/dogewugejasalebulox.pdfIn PDF document text
    • http://coumert.com/images/file/xifujut.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8f94956c9---lozel.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/44499450636.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e308abf2d---rejeturavuz.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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 14384 bytes
SHA-256: 99abd957c95f92316cc9c8f4b26e6db8ef2e9fd68c647b88c12cdcf05f1027d7
font_01_sfnt_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10748 bytes
SHA-256: b7b93accff538ee923662bd6b70ee12b071ba49b9e22751372e52a327fa05afd

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