Malicious PDF — malware analysis report

Static analysis result for SHA-256 406e352b9a1a2bea…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 12:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7aca788159313290e874ada1fd4bbe9 SHA-1: 47144a87f59fa5257489f74745bcc6dba154e95a SHA-256: 406e352b9a1a2bea876541a1eafa290f0c2845e2bbe0eac51b87c2f1b9765141
164 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The primary function appears to be redirecting users through a series of links, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pielinks.com/UserFiles/file/vokuvogipid.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4ths5vrn3h754pmdtean71659j/xotezixin.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wedekegofo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f103df45aa9d89461162c2d4c783bbec/31746704295.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/17223026259.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210916171208.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wiwov.pdfIn PDF document text
    • http://machulski.com/public/file/22041459292.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b220d2e98---43696816938.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/midelalepubotuvixibupot.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453102327bd---63301537278.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/32000377838.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/edc07ac8b1cb619901cab6a12e34bcb9/sobuxojifib.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/jilapoposoretotozag.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/pagiviwemolobekexagijukep.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/ruwomegebobadiwavesigifal.pdfIn PDF document text
    • http://metabolit.ru/files/file/70147014393.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/getapedoz.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/jowiredagupum.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/64937244397.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091413504480554.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/bexujitedug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=complete+backup+android+phone+to+pcPDF 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_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 10972 bytes
SHA-256: 69e58c07536c0fa025b1b740d69596925b3f3e4f81809b0770031e7319a7048b
font_01_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 17272 bytes
SHA-256: 9c330210771872b251407ca8ba29fff7dfa6111069b110c0d3025e961721512a
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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