Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b690c1c421da4b8…

MALICIOUS

PDF

107.2 KB Created: 2021-08-25 05:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdc6271fe9e27f28451de5676cc2edd6 SHA-1: 7ecd409cab788efbd1feda95444c0d80b6c8da4e SHA-256: 5b690c1c421da4b826dc7e69702e34c865b9ccb06585d4f401302b8f177d942b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted from this sample, but the overall pattern is consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://emilygrilltogo.com/uploads/files/lisuxitutozixukire.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/064b2a3dc8945aeb3a8991de5bced601/48350616438.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jkpf950m5pt9qpe6m6h34t4kkd/18280960952.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a2c211bcc5963b5540bf37cf695d46c3/31125370829.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/76746825450.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4n8im8mjhnet97k6o77tffmoe1/pezipogiketenot.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/matetasotu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b0bb6c8a---49614275596.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/mpj5abtoqf42r60j2n153g3vp6/67606965771.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dc2gaktnfcm0sqem4v61eqliq3/nexabujenija.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/viwipajolubiwaneniwilu.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/zawolememozugewaxotutatir.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608072613dac8---xagalebubati.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/49147720098.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/xevupejiwidip.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qevepnfjpmk59clqt4fj8tnd26/31553810239.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/23041881335.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607915ebec224---mekivafovol.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16109e4004eeb1---31763219728.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/bopafaselepiluxakobakadew.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/befexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+founder+of+legalismPDF 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_off00014195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14195 10764 bytes
SHA-256: 6fd27098f7bb479361bcffb074c060309b33778b388bd8ba7521a9ce5c50b8fc
font_01_sfnt_off000159d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D9 17420 bytes
SHA-256: e13fd881e436d3706fabf87a7de733da1197039651afe6754612d5ad6143e641
font_02_sfnt_off00018730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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