Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72e5ce592c74224…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 11:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23ef2231604c88cc23eda0dc41a310de SHA-1: 2f9e5f2572b1bc8d677933a90f32c8cda606789b SHA-256: a72e5ce592c74224fd81b8f6f69819f214f06071f35ecb10de21fa4ab3b26256
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ec99f1a9---97815042322.pdf In PDF document text
    • http://farashimirooz.com/files/83264037820.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946dc85253b---goxidepatorelobezedu.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/71554533382.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2ed9ac557b76a84d1eccaf60a638ff79/tebitutunide.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/kizolasotavogezagatoru.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/39755354623.pdfIn PDF document text
    • http://beta-rc.com/upload/files/majazanobofiw.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/24142943188.pdfIn PDF document text
    • http://rs-entp.com/upload/file/jubureripelap.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/08a8eba882c10798634962d349f2ae49/68252088056.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xibipoleduvajegufanaware.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887db08e70a---95610286728.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/93726866.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/somewogukazemexokofapip.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/6226791348.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc31986ede---witarexunaseta.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/12697108685.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a2f5257d4---mepanexefutijirebot.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/29074960381.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d236a76beb076e7d19775bae55992050/nunitapezebizomenesuti.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d8c66bbe4176e8aff9899ac6601a748f/87023384368.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f8a31ebceb3998662b89822564422bdd/zobepukixapaz.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/66659532041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=grammar+part+of+speech+worksheetPDF 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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 10720 bytes
SHA-256: 71e6233b7ddf9321c45da494c7608748fe5df64d6d968f3a8ca92201625cdfa1
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 17384 bytes
SHA-256: 7f2cc2c428fcba282d5fecd016630dc2a53f0018bf5c26798e9fd3527c1a5a16
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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