Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7262d3364f993d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 06:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c4c1d411185619f0c4614cc307735ae SHA-1: de9d3f7ddd207e0c5094ba008b16a585fc4b73c8 SHA-256: 5a7262d3364f993dd7d6d8214fd0ec70839a0754a869aa37c66fb7e365570ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=brain+out+escape+room+level+16 PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6f727a96.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/batexeriwubevokidu.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/73718769697.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd98da7110---jawojuxifexisiz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4565e41ca1f18b86da056f09c7711aeb/returu.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/38668240444.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mbkhjsf7on19m1sd8o9sk5hfp6/88875684113.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/72202879612.pdfIn PDF document text
    • http://le383.com/uploads/files/lavezamejibedojod.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jijunelefufaded.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/50678548680.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/jerelux.pdfIn PDF document text
    • https://airshow-bg.com/file/botimixok.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/8478154384.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6201a437d---87042766893.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/it3iiavfc2amtveecm0do3puvj/vofawunetub.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c382f895---11958978959.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v3mnlfrtdas329sieboc3enpru/25530670301.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/92593325264.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/28r3knla23v844aa38bmnoreov/mufavivebidegulabuv.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f0f7f61c---7228165689.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/16572572628.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7db2d3237e77ac251b199eecc426266e/doterob.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/21766024ec1e6d2415f02f00c3c1b829/tetewedanobale.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad762f3e7ec---81132834888.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_off0000c2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 17248 bytes
SHA-256: d897b013c8eb4bd5df9989262933bbc683e027fc2b2a951f375239e96776723e
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10972 bytes
SHA-256: 547f41cf1c355075ca1b02d33dfe3dd66ccc8c4541dc87ddedb4f8ac866e07fc

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