Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de87993263dabce…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 12:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 856ecca8d952b3f5bb1a6358e758809b SHA-1: 8dd532747d695a1bf94d5a859c5f0fd1b8682922 SHA-256: 5de87993263dabcef93da5b11d69e79de285e29eb16ada606368096ac6017a00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://domusanna.it/userfiles/files/52968705656.pdf
    • http://allnatureint.com/userfiles/file/ranixadetulojedarexute.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4fc45b4d---71835702892.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/32l124uiju4huub8md239vj790/domujebizekexupatu.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1591df3b2b59150d0ecd698819dbab25/90406351794.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jaluwuremonimisajoxolubo.pdf
    • https://mauspro.net/upload/files/66520206286.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7dd9ee98---27658040032.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/pomevisikisutufexi.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbb828ea53---83639808190.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00f037d1f---21220433249.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/bd33dc5d8d6723693d3b452c43d9a53b/14686762628.pdf
    • http://arkystudio.eu/userfiles/files/68694392500.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6589e277ecf9303d9ff4f2687c3a5572/2187521974.pdf
    • https://songhong.info/userfiles/file/divegize.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=profesores+in+english
    • 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_off0000ec10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 16792 bytes
font_01_sfnt_off00010422.bin
895a513a5dd4f560730ff0288eb76df6ff02941d8e001e8663299104b9c84f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 18792 bytes
font_02_sfnt_off000133cc.bin
6a30d1d37fe1f5ce9718e9a32cbe60e01e4a7453e85c3da0be73cc0087addafe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 10232 bytes

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