Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ba2c9940aa8d01…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 20:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a700fca90395e1174aa3f08a1c31f967 SHA-1: 8d087d8cadb0b24b7cfd790671ff72d5af97dc25 SHA-256: a2ba2c9940aa8d0196d38a2d07a437f817a648a819954da461c2d20eee76ad0f
204 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and multiple heuristics indicate malicious activity, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The 'Clipboard command execution lure' heuristic suggests the document instructs users to copy/paste commands into a shell, likely to download and execute a second-stage payload from one of the numerous linked URLs. The presence of embedded JavaScript further supports the execution of malicious code.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://bloomlight.pl/_bloom/file/74159678895.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f99dcd39b4d---68211219760.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/boboveji.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/md9in3novjnm7i3ddlkmil9mq6/96294152083.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610061923110c---sirupeli.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/21375039542.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeee79e7e6---60813062639.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/92678157591.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/50043641317.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/1142275932.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc2566067---70135202122.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b278b5cce0da9333a0f296692d88a4ea/72194087786.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tudowofaxis.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/74181031530.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/85683814049.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/tevetuzoga.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/wofojogiduwi.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/47081910522.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f1e84725c---dovujulabijisunibofefasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=digital+logic+book+pdfPDF 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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 17944 bytes
SHA-256: 7c8a19990f7c0da7bf0b56b6585a5160596e549d1ba0d9fb9cf7e9f46398883d
font_01_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 10524 bytes
SHA-256: 8adf433445f0cbc61def7b83071b0e014917b633eba14f23cbd54dd57d90df26

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