Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4ecf22edff7059…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 09:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10790733b480b7b5a705d7fb087e1124 SHA-1: 795e1463bad53ed42115c5d021803e0d914a93ab SHA-256: cc4ecf22edff705944e100bf99d0b7090ed437b800ebfa01464def6accd3ca37
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=frequently+used+english+words+in+daily+life+pdf PDF link annotation
    • http://quiltingacademy.com/fckeditor/userfiles/file/27254493315.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/90768096405.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0baa1e7e45---56947124743.pdfIn PDF document text
    • http://www.asslar.de/downloads/mawazemiwowikixidej.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/208014359.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627056155.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/be0844eb54432543c67e267180c819c4/foxene.pdfIn PDF document text
    • https://datenglagi.com/contents/files/88037281337.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/bekuxuravawixoxemesexakoj.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c18c06db0---13284945745.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cb8d98d94bb85138e367bab27298ad42/39766350323.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0d45695a---73920904037.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/lesetokuweb.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b321cc83f---49025588801.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110efee5c9ff---tazanajebaxedudo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2e584faa2f000e85153a1cefb1cce76b/46432960794.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4cc9b131---pijate.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/67338635125.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/554d3e6cab1dfc786242ede29ad4cd0b/xojututobugasebebamilote.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ohm94d92meora62elufdjun854/75848324116.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7i1f0lva3dpgmqomfqc1i58qb8/rezujil.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/vekokofamuvewu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608422728110a---9363202649.pdfIn PDF document text
    • 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_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16912 bytes
SHA-256: 76897181f067c587efd54950e4ca4f8ae613e30028f031c54ee67fe073df56f4
font_02_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 11200 bytes
SHA-256: 93d40a04a64028c4746cc1a6d330d824f0a9d95d5504cba223ecd658b456041d

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