Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e23a4fcc618ed58…

MALICIOUS

PDF

73.4 KB Created: 2021-07-07 12:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbd14ff8a2e0a1182df4dd36aeebdfdf SHA-1: 982cfbff94feaee4524617a2aecb2b379fa49a83 SHA-256: 8e23a4fcc618ed58d862a824ce7470de583c844b73d3cec48ddb1311d921ad8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The PDF structure and link farm behavior indicate an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5d1bffe00140ddc405e23e7c5a1e4e97/pupepumasinavil.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pu10k1l0jl8500c6g2gst6u95m/56058305634.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/5d5a463ee7f07687df9cf974ca506a5b/xukozubakarivirojizebij.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf3b370c6---sofiwekunuxizenover.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/kemomatiz.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608e8d64183ab---wopotexatedij.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/68938111907.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/9081332032.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/85382545929.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160716b0619071---71733295584.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/gugiduzogigubolijikix.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ed01d3cba---wepek.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ovhlpmt5a9v7e0d1480tdnclf6/xoxigutiveziloritovexul.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/44421742877.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6ece7397e6f23368000dd80c6f8ce608/mowixofasef.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/rinonunovarugotapigof.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dd28d834dfdabe0bdfb6df9f4ce486aa/1127368649.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/busovipokidajo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1c7b5288---56393961655.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c43b21c15e32ccaca5e627d5a290c3bc/64560717527.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/lomujewenotuvugexipomu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6cad6ba047e1b11a510428722783effd/dezajinixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nelson+english+student+book+4+teacher+guidePDF 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_off0000badf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADF 16836 bytes
SHA-256: a8f141bda545175f1b75d5f8a344d2002a21c019f2aa03b5f11f639caa5f0903
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 11036 bytes
SHA-256: 623b2e6a157e4418b21b21e0d7faee8b9d662599950c87bae7e7efa6b6a62730

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