Malicious PDF — malware analysis report

Static analysis result for SHA-256 a597d4863a9815f0…

MALICIOUS

PDF

83.6 KB Created: 2021-08-15 04:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 053fc414e84fb613db538654476a85fb SHA-1: 111c92672bdaff6b1682a1115ee62676d9c6c2b5 SHA-256: a597d4863a9815f065e9d29092605b0315fdd611b85d86711fe2d7529ba57d6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pmko1ke361apfb4k56mk0gh1tm/31985878243.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9814dd3cede8ca1242b3db665cd75399/sebuxewemipebuzuv.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e80c04b2cb352db15ee866ae4498a1b0/kamiker.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/46d238c68c2d38e0b45016210de2f555/3180069244.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/10008351970.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ee86275871f8ec7df96acf3f7a48458b/rofinexokotenefepum.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jg7duja0tt2b98f4ingr2haegh/48056862521.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1a804544---84257979951.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082570d9129c---84041922638.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c257d4a215---molakunigusakivojoliterir.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/89056114813.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tekavu.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/situtuveli.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63779815535.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb68d54cdf---60038433874.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/592ce2019f981e6d8115f5e7823fe03f/tonirawudulubirow.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/lolowazojotodamoror.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/sudekodafez.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160764c64b2458---13072440279.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/tadarilojufagakejanojugi.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/zesone.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/3513361055.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/negaginemubejepera.pdfIn PDF document text
    • https://eurocomm-italia.com/file/95893492408.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/nedesulebezek.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/80069438300.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/jovubamunotat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=otium+bluetooth+headset+manualPDF 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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 17524 bytes
SHA-256: 58676a37074a8ba887fbca89795f0d0b485b2a4cc6622b849f3b7c41bd21f85f
font_01_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 10680 bytes
SHA-256: d66012a10b8d3544e05ff273a48bdb01d997233e77e0be33aaf877c7dd8c01b4