Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9dc44b29274bbe…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 17:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d542ee46c0c99cca90c524e7a81d21d SHA-1: 95fe97d6e0f4a771da9b2513573dcb77603916cb SHA-256: 2b9dc44b29274bbe51930d825a82d5b52a3fad7fe0fced19987f569d16e0ff38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with some identified as compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a731a74a65f---71313876513.pdf
    • https://goldenapp.net/file/tomowatimevufujalugusanog.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/wowaferuw.pdf
    • http://chronocertif.com/userfiles/file/36140818321.pdf
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/rajarabupisuwukijigonom.pdf
    • https://adian.eus/files/galeria/files/kasedigesirujilupiza.pdf
    • http://iltorg.ru/upload/file/53545731462.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf037f386---64275605708.pdf
    • https://aartipalette.com/userfiles/file/75667868209.pdf
    • http://cpspcb.com/uploads/files/13994645364.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e13fea89f---58587426895.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f2e8487725cfcef498286d3017ea39a1/wezivosilalo.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5534120c2d---vidamomixuretif.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d368efed2b64b672e8c5a6bc07f82a4a/pixoj.pdf
    • http://erodiertechnik-wenzel.de/userfiles/file/23557393789.pdf
    • https://psfund.org/public/uploads/files/cms_files/namululirinidip.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce244a4245---zomenatuf.pdf
    • http://bagiez.com/userfiles/file/10154777928.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f67a003e4db---remugavag.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/gujalaf.pdf
    • http://albarossa.jp/js/upload/files/76665930973.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=democracia+participativa+definicion+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001113d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 16792 bytes
font_01_sfnt_off00012954.bin
9601db42309915eea19a6e01ddf15f450d5136c80b6b8f54bc8e322c3ce30d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 10636 bytes
font_02_sfnt_off000141a2.bin
5a7ca8e5c2e0dfbaf3833efca9b6af40e3f328b3457f0d0b4a4dac82fde77874
pdf-font-stream PDF embedded font (sfnt) at offset 0x141A2 17940 bytes