Malicious PDF — malware analysis report

Static analysis result for SHA-256 520f64355c0efb80…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 10:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b95486b5b5ad8b54992e79d1cc92290b SHA-1: 9f7319205d590d0c99bd4d992fc15cfdc4b1b6c2 SHA-256: 520f64355c0efb809af9028a1a1d8bbb9081abf07626a1419fd45e2753d1a8e3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including an image-only document with an action trigger. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are presented as a link farm pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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 69 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.
  • 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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba0f2565---59370692038.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/bcdcb39edffcea6fa9b004894f1c1524/32279796904.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210917092921.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/wuwuvazexoxugemebi.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/72663745936.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210924142409.pdfIn PDF document text
    • https://digicpictures.com/downloads/zibarunen.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/69602242161.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5d6bd626---22221718196.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/foxofopefobelu.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/mapetuvivigonom.pdfIn PDF document text
    • https://activepymes.com/pub/file/5345227333.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/teniwifalutovebito.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/35198301426.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/34256670050.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zukebewegikuse.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vomapulovoluwadiki.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/gadavas.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mcjrmie2s8e912o1u8643op30m/31889943814.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/puxizewerepijidogitekilo.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b75b0897a056b0b0c1c6a8ab4e8e0a99/jubobebo.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/zemoviloparokoda.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/78241057215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+ball+z+tenkaichi+tag+team+apk+downloadPDF 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_off0000b141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 11172 bytes
SHA-256: 5c39db3ce6ef9c4bbef7b030317970d47ce44a4842257b85e1907e8be3824758
font_01_sfnt_off0000cacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACD 14412 bytes
SHA-256: 5985e8452f8b7aeaf3d97be4eeeed21d93369c5face272588ce8dd344f885116
font_02_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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