Malicious PDF — malware analysis report

Static analysis result for SHA-256 099ba700da295b41…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 06:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe4efba0b41646d33897f8e5c25ae8a3 SHA-1: 2f571a5471cc250d64fc19bf45d7ae02e8673175 SHA-256: 099ba700da295b41231ea7ac20d5b13bd314c647fb71ad44577df0553febbc08
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The primary function appears to be acting as a link farm, redirecting users to potentially malicious or compromised content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cad87f560---82167026134.pdf In PDF document text
    • http://edmo-cars.nl/images/file/98771478760.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202108012359277991.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/dowufonizonilalukiberufut.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mazadavu.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/fuxipugesujarapekakuve.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/73409650737.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/374bbdad3f6d425acce9b0c95cb7615c/lanifuvatasupoturofuge.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8cff84992555d96f9baf2175b468d131/xezarikuvefelugeloguk.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/47560382859.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aed559aa8---3046123026.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/33048176295.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/dutulolokekipusamigisem.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701bd31a831---86754877545.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/benufov.pdfIn PDF document text
    • http://nensi.si/upload/file/43939839331.pdfIn PDF document text
    • http://fkhd.cz/data/img/64650299065.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/k1ic5ork0jcomf18mrgolblj77/27166424706.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vnjc3nmhqd8d3jfqh9ja9ufrh1/dutupolopisuzokitozeme.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/mibadumawuw.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/13221945120.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pepagelivafe.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/wokipujapimaterutapaf.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0f711008---luvaxirolutupetepudisuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=abdomen+anatomy+questions+pdfPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10996 bytes
SHA-256: d8f503c5d0eff645e748e5b58b7dd8b194f998c25712aa6ef6a126b645701434
font_02_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 17064 bytes
SHA-256: 1dc60b67308fb68828ed3ef922017ba3d55203c3517a2492ea472ceb7fca2057

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