Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e2ae3e7ac08150…

MALICIOUS

PDF

163.0 KB Created: 2021-06-18 19:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9bb3034c479c8910e42edf2dc4342e11 SHA-1: 208e09965f91c6783c5b357ebfacd87064206d3e SHA-256: b8e2ae3e7ac0815064d2b2aa205cc587b6318d71d9e0d01d98547cf0a44e8854
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ad93jjs912eli134h0mnh1sp52/64576510355.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/69026196591.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf88b897c---18605708814.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14ad013d4---58560476256.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/kepizomiguzamunixesex.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0j8bf867lhmn1lpsg8bp3tp1ge/22860176999.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/laxuwavozoveme.pdfIn PDF document text
    • https://ivaco.it/file/fafeliwerizotunixivir.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/84378397041.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/25994355707.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a1d0be2719f4516676755b69d8a707b8/kewabexowumijo.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/73361326163.pdfIn PDF document text
    • https://alutat.com/data/file/kesijobovi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f808476497---92188537063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+season+2+episode+9PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B808 44792 bytes
SHA-256: e0ec28bfb53d6c61c62849f71495898a63dea1d463b3ff8ee9cb81d6487eb254
font_01_sfnt_off00024108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24108 5684 bytes
SHA-256: f667afb12fa51543b2697144dd27e31608708762911e0dd9cd49fdd1f3975553
font_02_sfnt_off0002548a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2548A 12896 bytes
SHA-256: b69e3ebed7661c7ecd986fab07cd30bdbe6b4c74d3e4317e8b09badc0de107f8

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