Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d48440f8fac039…

MALICIOUS

PDF

98.5 KB Created: 2021-07-16 12:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d27c7e9f504b51d3067a3e8fe35540c SHA-1: 8b526a6e9a3a6044af69e1b98d3105c82cc1e3e1 SHA-256: 35d48440f8fac0397bf6aeed08adda984baedbfe5abd6676b9a0fa6417b0bad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=reproduction+in+flowering+plants+mcq PDF link annotation
    • https://rubin2000-distribuitorshop.ro/userfiles/file/74248990530.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/44373112791.pdfIn PDF document text
    • https://hirurgija.me//files/51806542981.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d2c0d7ee9f16ece3c9fea52a9f9809a4/fapej.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216231249187702.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/wifoxuvex.pdfIn PDF document text
    • http://erex.hu/upload/file/76667832666.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1b85df7a2312b14cad981afcac2adb04/novupanemibubidajikijo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609039e59bd95---vejanebivosa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c5e22dedcc2597e3cfb9635e4a8eec04/4227318796.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/suvexojegepurizapi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/b1sdbbm8ch0244m59mb43jifoh/vedijotukavil.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1f74225dbc6b2ff0197a663866a24114/perusoxurekatizedururu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f17404652---zemeda.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f963a347---polulorirunudisopuvata.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rbkcn4433r719t7ana530o5m01/59746586864.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f7a82b5ae58ff7eb9bf117ac51e821f4/rudewidorik.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/liriturojiligaroxojavat.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/030837171693.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f0a1103c0a03021b8b0dcf2c9b021252/29085416877.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/ginanuvogowotudozo.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/wefuse.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/9uqvdnfajooqnokpnr2vfco70g/vogaxazevoporiwivuda.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_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 17676 bytes
SHA-256: 39187811b2cba4a6c691eefa58c3cdd8f474b02cbae5815bbb51cd4969be5dfb
font_01_sfnt_off00014a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A79 11340 bytes
SHA-256: c4037656529f978edb60f85f6909b65a90ee6b8a36f92dabdfe85bc8a3014c55
font_02_sfnt_off000164ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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