Malicious PDF — malware analysis report

Static analysis result for SHA-256 5126a6be9321fa5c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 01:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71481e86f5d1b88bb3d200123ee44291 SHA-1: 5604aae739758c816b7c539cdfad18f97010d285 SHA-256: 5126a6be9321fa5c24d2b7c35e8c4e12cefb13ad454d317f7fecdd102509dbd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, many pointing to compromised or disposable hosting, indicates a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 http://regcureguide.com/files/files/78076220796.pdf In PDF document text
    • http://ainut.fi/userfiles/file/berajesenurexijizez.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00c6ee1c6---70824980329.pdfIn PDF document text
    • https://tdfstore.it/file/14349631533.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/2280769823.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a724c35fc3---bipaxadonesedevazisutali.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/38595697240.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/70104645298.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/99786654612.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/40690119641.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/87915454380.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/93777792583.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/82597351487.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a933c76d5d---vesarigemalofape.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/89659868523.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/jopufuxujaloz.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/13753766361.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/40075524320.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8490542ec53dad06368534289bdd65b9/8585750689.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/48321639020.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/81033600576.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/25173751475.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b6401b51feb6058fd3354cb880ca9e69/70521804070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ditto+tv+android+app+free+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_off0000b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61A 10476 bytes
SHA-256: 8ccaadbdcf456e52506b6946f3ec2964270022c6f9f3b551eca9fd4878260550
font_01_sfnt_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 16616 bytes
SHA-256: 503180803d180bacd537cf91f36e7555b3e589016fe19c4f88dd7ed7141a501b

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