Malicious PDF — malware analysis report

Static analysis result for SHA-256 7244034ef9705cbb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 16:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 87e01bdde8e7d95c741312babcf2ed10 SHA-1: 31514fb05e2d11721ce652c288d560f12c005246 SHA-256: 7244034ef9705cbb968a81df11653bc559314c8ea4e8e6c049f2bfff58ce5f1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=segmentation+k+means PDF link annotation
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/63527733444.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4476a96fc85e0f59e8ba7b7b7949db18/kevobim.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/67982528026.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/prve8de7cd8mvkvm02ots4a5h5/30462065323.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/21413252575.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/49877204363.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/debedazimezopexenob.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144a15257d0d---52772357906.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/tewowodimo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bajoxinotepajawutur.pdfIn PDF document text
    • http://sql110.com/pic/65199357215.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/wigibasum.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29fb17bfc---dosirebaxopezebefid.pdfIn PDF document text
    • https://securitydm.net/slicice/file/28907074655.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/kogupofeb.pdfIn PDF document text
    • http://veitali.com/upload/files/37837707015.pdfIn PDF document text
    • http://only-svet.ru/upload/files/nomimabaxozalurola.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/narewaf.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/rowukatupamupa.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/josuvilovezojazasosop.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/lofisigoxivunakevujanapu.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/93106917452.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_off0000c3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A2 10472 bytes
SHA-256: 2fa77267ed1a7f4f557d4a590bb63963301a55962b4f11b25811774bcf51015d
font_01_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 21860 bytes
SHA-256: 9465a4249496f2efc7c8cd9b9211f34c60f7e2d4b2817e5a0a4272d11d664269
font_02_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1