Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c2b07071ffdc43…

MALICIOUS

PDF

92.1 KB Created: 2021-06-27 16:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b42a7e6f9729378a918fc7299fec062 SHA-1: 77ac5af061ec262a63df2200fc3d308bae1c9e90 SHA-256: 45c2b07071ffdc438c5e02ea4d9ff90174e7ec239cbee6f7088dfe4f287ce3e7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • 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.
  • 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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160958c52353e9---50456210953.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f82fc8f2b00ce84a2faf165513b57c43/metonosix.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/sak3ick6tfrpeghd55klp69r8s/zorurofu.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/36008003289.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c4cf1ae8---zomuzunapigukaruwajiv.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cpvhruc1oudq2eg25qi3qssdq1/29049523392.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b657b0870b9---tegunefewiniviturob.pdfIn PDF document text
    • https://farstaslottsvik.nu/anvandarbilder/153/files/wisarokowobi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f520302d37---74494097426.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e43d7dea---59032626617.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/3343163235.pdfIn PDF document text
    • http://traviet36.com/upload/files/8601361272.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gaxeda.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62771e489---91990845518.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a7d0a4cd5c11ca53d764b429edba60c9/kazeketeto.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1911af427---fijesoloxesukoreziw.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b581f52d---wakasabuv.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b948550926c0c1a617228532fd9e8c34/48925314301.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/32649930102.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rowomojalozejawe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607901459c30e---matijerozowobetureso.pdfIn PDF document text
    • http://huntland.hu/upload/file/gojaxatonanivafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=westlife+mp3+download+something+rightPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 17376 bytes
SHA-256: a9fdfb6328de867f0653083bb6e3f9303354d0bf919a20256609819acc8cb718
font_01_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 11196 bytes
SHA-256: 5d3b373d53106924322378ddc592a4ec26f00f2753fec16342e30140e595326f
font_02_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000143a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A3 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_04_sfnt_off00015919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15919 1916 bytes
SHA-256: 67c5ddbd459e9d6974a954eaf59486e83027932b73086d34a83c09844c061b01

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