Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e17c0cf9797926…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 21:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb037f2a98f775112a3a106b81ecbcd9 SHA-1: 6e80137f59670c746c97bd731f222204e39c9de8 SHA-256: 95e17c0cf9797926efa1daa0005fd5833ecab704ed8f5b99fe4b57430dbfffa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests a malicious link farm designed to lure users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://activesolutionelectric.com/images/file/lafaxateneboboluwijosi.pdf In PDF document text
    • http://writtenmail.com/upload_images/file/sukuvosupade.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/gegasapusetimojeketi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/vonaxirewexosadividerutuz.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a185fa110a3---81676973556.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/ogj1nf76f6mipvu5ogf8ar65iq/kajebu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/69384591507.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/wipiduzaj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc0ac4a3f---96161651997.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1891a7b2030612901a1b16e25b5afd02/27638509818.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xuwerotunoxarotan.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/36162138056.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/vapofitug.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5olhtmk82ifed53o3p6eh3e7b4/zafufurolapoku.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de28d08c83---97569800846.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc397ef3f8---wivitigazonatimabupeb.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/kamilexixekeri.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/bijafarenapidefibuj.pdfIn PDF document text
    • https://12waktu.com/contents/files/29566214333.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/pafofuzuzudix.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/24120121287.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110d0d2758db---86139571545.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ac07735d5653e2a0c462c24b55d015d9/kezidevepilubibepegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=visonic+alarm+powermax+plus+manualPDF 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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 10692 bytes
SHA-256: c96a5804ef1f4c77c78d4832eb4e40b41003f5231b57db0736faadf98295deea
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 18256 bytes
SHA-256: ee178982a6e4547620a3dd2af11e308636362f1d011597ebd19d7acd2c76d5f4
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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