Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed236c62b53ad87…

MALICIOUS

PDF

90.0 KB Created: 2021-09-19 02:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d037c7e02d316b77f64fe0b5c0d9452 SHA-1: 112062da8fc1ce4882155d4aa6eee3e140d78fb8 SHA-256: 6ed236c62b53ad8757b99bb446431e8ef516210d1b6d1d33c4d02f9aeb99fc1d
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous links on potentially compromised or disposable hosting services reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://paillasse.hu/userfiles/file/37573199982.pdf In PDF document text
    • http://marikitaberbagi.com/userfiles/file/xegirunojalugopusesox.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314576da8fc---1901196979.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/22085647435.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8abf0af3---libep.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/bujozifagulebibubadazuzo.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/69653852532.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/vawujifabelapopofojexum.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/jonirivebukoxuramazekenat.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/pawama.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467a01b83e0---bopepawulegoporoxupuvo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cb48b6b59f05a58fb16755b037cfb2a6/salonizimonulon.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/40099883406.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rosfte0m6vmh0da5e2rntgh7oc/lejewewesusi.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/pujafezamagezadesupovi.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/72860070984.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109091025429275.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/vizobunox.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/13052736042.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/7583441109.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/54634010132.pdfIn PDF document text
    • http://falerisztika.hu/tmp/32951452163.pdfIn PDF document text
    • http://midel.me/userfiles/file/ramogajosowixik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=super+mario+run+unlocked+apkPDF 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_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 10676 bytes
SHA-256: bf2c70e5e07b2580aa5c6a93699a0647ea55bc34f048bc344386728c0282095c
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 18100 bytes
SHA-256: 5d44bf6df8a62c570de3d6c834f8c80d8cedd5b213eced613d16764ec53f2604
font_02_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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