Malicious PDF — malware analysis report

Static analysis result for SHA-256 05849302a3a2ef10…

MALICIOUS

PDF

87.3 KB Created: 2021-08-01 06:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 21cb4e1cbfce1cdbe65d208e9f861291 SHA-1: 0064864d0f82d891a9ff2dd9598760f75b780f9c SHA-256: 05849302a3a2ef1086a71bf050cb539ca3c77443d68ec78ad0c086ddff609eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and domains often used for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest this PDF is designed to redirect users to malicious content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=accrual+basis+accounting+simple+definition PDF link annotation
    • https://nhaccugiare24h.com/uploads/userfiles/file/79036588345.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/minekipamapaj.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/33f06c4c84a9baf655544bf0b6ba50a4/xupolufujijiwazudaridod.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9617cd244f236069cd9e29ebea400bd5/77504296858.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf96b0e22---72121618448.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/bifoxalome.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/88756752258.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e082aadf---konorowi.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/napuxuterawikebowof.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/popuvuja.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/au5m5eqto0342kd815apdfr76j/zeremogebakisefiwe.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/tunipatufaju.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1c05c610---ralubafipidow.pdfIn PDF document text
    • https://airbays.com/userfiles/file/weloripagozemov.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zetamukanitijuma.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/824a4696d34fde8b80a81cb971f5cb8f/sopini.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/zoxorewimonox.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/tidasuzuk.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/32897948004.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/70740141816.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/55790435638.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/nubodatiwevudexavesosodap.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/gadomexogimaxilawidi.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/21172173475.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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 11184 bytes
SHA-256: 15939b622deb9043cfae314480bf93008f7fc17e903e4c87a8cf427b6c4ac34d
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 17532 bytes
SHA-256: d075cd59fd2b346b9401ef9a7e7eb167d3ad4c4e0f5ee7c0dd40a6d6f9a31e12

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