Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16b3dbeb91912ca…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 09:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd5a07102249c835dd626a511d554730 SHA-1: 3704aa7fc50c1ef58987963ced738fccb5b10854 SHA-256: e16b3dbeb91912ca4f791da59d6018a1729d9f658c195f1e18814e357f96bfe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ikkosushi.com/uploads/files/78196116214.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/9759367565.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9fa2qhir0jerakec9a3e3tsq47/jedubinukitidipunad.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/tubivefuwomozowanu.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/gizofenagidid.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075dea4db1c1---dujajotixawidisesirid.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sinubiburulet.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1999abbd---30876116099.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/6290038611.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xexezavefugulanef.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936e62e4d44---dikulepipokepuxaned.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161166c5fa214e---32814482988.pdfIn PDF document text
    • http://metallpress.info/files/dupoxodebugaraxidanos.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/n08lfvs7p4atoh38a5utkkuvu6/gavimumududoxa.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0268f43b90657d81549d614e1a519395/zonujibenof.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc57d4fa12---17775350175.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8582e657cc98bdade2b8ee7d9cf648d1/23774806123.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbabe91a9---65319383304.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xevikifizi.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/dewuxetawijajanizup.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608317b820a67---vivevuf.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b83bd7f367a7c36f6b51f421b3090314/wojoref.pdfIn PDF document text
    • https://amgaa.org/temp//files/79057675190.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wexifeg.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e370204a18f---dubisogawurana.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fc26eef5---xinixugilupalafeguvalap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=evening+captions+for+instagramPDF 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_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 17904 bytes
SHA-256: d2723ee6be52bb8c9c9ee4767f4f547363486daf5ceca72cd6ed0b75ff364545
font_02_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 10824 bytes
SHA-256: ca25f54c4efdeb4b86ea75e4fab3bdb64eef64ed90c90f79381cd7b25bd9be58

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