Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d379e2807a5f2e5…

MALICIOUS

PDF

83.6 KB Created: 2021-08-17 15:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d848695511085373a15d1b63c8b8221e SHA-1: ff7c9c130852c7544a0a93715ed08ef84bbc5ada SHA-256: 6d379e2807a5f2e5b86b63bd890b6566e6a84ec7963006ac52f5e40eb5fa0bff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised websites and disposable domains. These URLs are likely used to host phishing pages or download further malicious payloads, indicating a multi-stage attack. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=how+do+you+record+intake+and+output PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0fe234e73d6c432b7c821b9554326976/butozuxoritafufusula.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/66934295645.pdfIn PDF document text
    • http://amandamaitland.com/images/file/86764512566.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bekazuvipuvirepo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j7ci2509hgcunim743cr09tl01/lasegekedevemudosex.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/51658917129.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74fe0e872---jorafanovisodo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802724704c1---99904000382.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8906072d1---fagoboxejujebivira.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ktvvko4hh2komd24q1n9s0r043/61021250752.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/jixademuvon.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/60062744591.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/50284741913.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/xuwupilapexalarazax.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ludavuworesiguba.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/33430373361.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/reranisiritotoleg.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/nuramopuxojivija.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc55700b1d---47637351910.pdfIn PDF document text
    • https://kueapem.com/contents//files/21893897172.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/wokunawov.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/99041085036.pdfIn PDF document text
    • 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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 10676 bytes
SHA-256: 0939a63ff0255c0426fdfd36e039914b06ffcea195ac28412316d30c189693c2
font_02_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 17092 bytes
SHA-256: 7d907916cd62224d28a1820c959ed696bda41e38e030df8fa7af74785615b0d1

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