Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b2822efa7b472…

MALICIOUS

PDF

87.8 KB Created: 2021-10-12 11:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a01bf806c9f45757e120df7c1686b00 SHA-1: c7cb61245d5327dd0b820d7172a1d55095759400 SHA-256: 8b5b2822efa7b472d825752146ce920176ebdd0e8023f86e18e9528e433f71c7
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple disposable or compromised domains, some of which host further PDF files. The presence of a 'download button' heuristic suggests a lure to encourage users to click these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mastirz.com/userfiles/files/71423170202.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/sakoxifipagagetumowawerad.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/19171019870.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nojunigen.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/46769495367.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85911329691.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/rumumur.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xapogozebaderexisipog.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354d846d797---loxil.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/63663680328.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/lekavarelijezofoja.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/53550762805.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zegowima.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/98921173943.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/kozuzitidozezibaxude.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/16525092117.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e79418b1b---tusobikuwobijujoxisejoge.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5a6fa8a338c44e487ea883b36071cd6e/korolur.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/45191871444.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/suzewonesijolifob.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/jawugetu.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/97595862800.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/padamenifuzegob.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=expensive+things+that+start+with+the+letter+cPDF 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_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 19832 bytes
SHA-256: b5abebafe51be433bd3f548286b796a9c3e01f9cdb590eb8aaa48e2539171bd6
font_01_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 10772 bytes
SHA-256: 4e03085c16360c9fb81f06fc4661dbe2bd9c7fbe73951d479f2105fdce3cbcd9

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