Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deb8471ac75d3a3…

MALICIOUS

PDF

92.1 KB Created: 2021-08-15 13:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cedcc8495f1aef3ebbc4623154ee85b SHA-1: 25931d47df679481089e4b65089911d87cc1b048 SHA-256: 5deb8471ac75d3a33ada7f273e188a8ff7c2524ad6517fe92921580d6feaaab3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains multiple links to external resources, many hosted on compromised WordPress sites or disposable domains. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=minecraft+windows+10+hacked+client+1.16.220 PDF link annotation
    • http://medicare-darmstadt.de/bilder/UserImages/file/29861428266.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608613573b2c3---sobinanukilabatomafe.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wevukerowajav.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210627012547.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac188b41992---nodosoxeduzibixifudofo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e79ce1ec057c9379c3101a86d2525458/zanoguzesetiner.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/lubesufokipo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0af961e39de476b8b619788c879e6c52/mefikigulajigelonunad.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ug64fb571j6ec12su9c9ja46md/93350344413.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa23358249---82674091189.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/86217666803.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31635733540.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/91144850707.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34160602765.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/11f23cc5e219707ccf67e2893e447857/96047606064.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/37871270361.pdfIn PDF document text
    • http://camwater.org/media/files/89099830345.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/xozudugimepulepufejom.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e6df1385---zadorizegipotav.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/8220690100.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wuluxavupelopikum.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/33248923898.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/wutolevuzuvetirepimufun.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160904c45aef55---93339157764.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///fesuluj.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1qsvqgdsf4kc8r8tvrdtc2jdeb/duxolebi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 9012 bytes
SHA-256: b4abd876a52ce87578f4da51d1f1b9cd3d5c8eb4e406384e9b3fc55d6fd79852
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 16932 bytes
SHA-256: 08d68c087cb2a693844d6110d1ff60a74b2c806eb8562a2686125886446c3063
font_02_sfnt_off00012ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 11272 bytes
SHA-256: 246ed21771d1aa0f89c7dc68f58dcac7341eba37305b76e5637567f289d4a081

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