Malicious PDF — malware analysis report

Static analysis result for SHA-256 676d6b046e81d957…

MALICIOUS

PDF

95.7 KB Created: 2021-08-21 20:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8fcb2b34fae209712ad088999340f090 SHA-1: ee999085dda4e6471249f10d4ae020d4fb484b90 SHA-256: 676d6b046e81d9571739cad0ee2ffad88553878a93ff262656432d79bb355799
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on compromised or disposable domains. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • 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 http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/rizimeror.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c201e966d---92743677434.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51849724708.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bc47290e---42645016845.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5222112fb9d4e8c1dde9f5b3d85c1443/11128981503.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fakudaxugivujemujes.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kipikavepegemodajinibafuf.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vaxezivodi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/564b5b8e290f3ee0a53ec0746f4c08fd/ralugugexadefid.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21ca5972ab---lagiliwasom.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/82807944251.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/terefiwumibirif.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/2863099228.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/tovorajujus.pdfIn PDF document text
    • https://okazionche.com/files/15196628141.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/4422636065.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/pogenivoxeluva.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/94493020680.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/teqd482uq25amln0mkqgm7qmlr/79769571187.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/27827220554.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc3fba705---rogidozorutikimomanivike.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/51635507235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cambridge+secondary+checkpoint+past+papers+2018+maths+mark+schemePDF 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_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 11796 bytes
SHA-256: 50ec4773485b454505e62f319d3f74355137285f4555c6a37f3c2fe1e9e058c6
font_01_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 17824 bytes
SHA-256: 6ec52d2cc09d4afe436e2e6662405617532b2b197c86da47d1cd5e01ed83e118
font_02_sfnt_off0001579b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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