Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb12668c7c6f905…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 08:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46202e6bcde6ad78667ab798f29dea33 SHA-1: 7415beb73378abf07cf22659b7560332766fb0c8 SHA-256: ebb12668c7c6f9051e149d4ccbe451a2a06bc2f13bfd7e40bc7eaa699265208e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable or compromised hosting reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://supermagnum-bg.com/userfiles/file/ziravozu.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gjjjtbie1ue8vqp34le340a6cg/10222662316.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8ed2b15ed7a5bf385755ace818779a78/jiwinizalozi.pdfIn PDF document text
    • http://mp-journal.com/media/file/6467528992.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/70435538504.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/podawutupujo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/43964173894.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6a07ba30e---xisakuxomajetelu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/14ksl1c1t863sefgn8l38jf796/ponudikoku.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160da2ba8c062a---venepotugewadaxovusoresut.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/46323043145.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/29291092733.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/nuviguvojifaritexamug.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/dexojosasupa.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/97690992175.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2b15a9726882540f6a120f4e0ce97b5c/nedazulapabifitulex.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/mavezetibaxasemo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ec1006k3i6rrohkqt3drd6t9qn/vumodozosa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b24844c6a760511bd566496f5e279232/lepulusopidokudus.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bamuzaku.pdfIn PDF document text
    • https://southafricapools.com/contents/files/36765596549.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/tujawamojidetapona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=reading+comprehension+test+pdf+with+answersPDF 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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 11152 bytes
SHA-256: 65f7cbea98c451b8a60385bb7fcfb5e09f8c98622beb42c1e3b38a3fc1738358
font_01_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16552 bytes
SHA-256: 2ef32144e9c1971633b363b9dcf061eea41e6546a0c3a5de962a581758a49034

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