Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1f44e27d5aaae0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 02:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b0e5fc43fac8d9240fa8d0573bdd566 SHA-1: 0ca09797c2788fdff1af345b045944af34087194 SHA-256: ea1f44e27d5aaae0494955cabd400d4b8c562092b9fdae9da083983e8daf2d87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=the+tower+archetype PDF link annotation
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/adfumcja3mg0il1hqrqasu62hp/sujesewekafuneludowenewo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce09858501---1282461180.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/513fa24fa7524562afe6bf77e1947ed2/jilujigimaz.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d3uot4ekl3rtp5fpb534jei5n8/kitukumasurepifum.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/10b27beb69cae6ae07d658c1563404de/bowanifixomizirufidaroz.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ff0d166caf37efe2db3d0ba3582a0fe6/79281091807.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/39745870597.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/53150694558.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/titona.pdfIn PDF document text
    • https://zold-kommando.hu/files/noxevisaxoz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa3850439---15218833640.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/bbf32b50ab926ee0ed33b13e2b1f640a/91042199225.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/9355310771.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f648f1a375---wovawigosotav.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/wijelixumoxuro.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/13880544254.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/32573202855.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/lisakafojavomegajawisev.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/30742280192.pdfIn PDF document text
    • https://jurad.eu/files/file/97992196322.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa173fec397---18557535792.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_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 17132 bytes
SHA-256: 171d05b9b59063dd3c0c2dd1c80ee044cebc881256015e34ea3a8a1019cabaaf
font_01_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 10224 bytes
SHA-256: 8e9ab9a50bbdc97cac1d4ece899cb6155f4ce1890a606dfcc843b5caf6dda231

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