Malicious PDF — malware analysis report

Static analysis result for SHA-256 029808d6cade8250…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 07:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74d6a9071e3ad74cc0b6fb02ebb6c098 SHA-1: c12551b46c793d830c827711ce342b96f9ee57df SHA-256: 029808d6cade8250b6ea8ae86c9a5fb1152afa0d87ac595cf89049d7ce900259
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable or potentially compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing a second-stage payload via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ever0036.com/assets/uploads/ckedit/files/20210905084258.pdf In PDF document text
    • http://star-transform-moscow.ru/uimg/files/popujisegarololabu.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109051245543994.pdfIn PDF document text
    • http://fourfoods.com/images/files/93270622924.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/biwijevifegir.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/denivurirazeperufikupug.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/nebobenefox.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/sutozozuno.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c70a48d9---mijukulavofabirutabuzevox.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/xawizanukufokalifu.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/1777451783.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wifolebaxedivido.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/63899861809.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/vavemuzazipefepel.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83133094225.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/13859181392.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/tuvoxusezun.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vibarupudokikawugajip.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5464ae1e6be124e87a8a881afe59bdbf/soxupuvibidinalirefavex.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/jolakabemejinenigote.pdfIn PDF document text
    • http://zuszdounky.cz/files/zebaxoke.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/mopogoxowajojiwuvujame.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/055d9fd1c7fbcb6e0e3bb970bd742982/7323890308.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/nofokujumakagixoperi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+internal+audio+screen+recorderPDF 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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 18640 bytes
SHA-256: 731ee42ed99c80c780cb66b419fca69ca6a2e3a249579e87e9453365e36a048f
font_01_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10516 bytes
SHA-256: 9c894617d2f953d4738ef0e11e9e963be7d33d6d5b6cc8d79012d39d37216c2f
font_02_sfnt_off000138c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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