Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e6e71c2c307e32…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 14:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f29a19955b1438edeb6e2339afcc5086 SHA-1: 40f2b5a41a1cd6c7b05128f66e35c7be4eac525b SHA-256: d8e6e71c2c307e32bed02543598bffc357c5040618a55cc173b12ffebcf799b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=android+games+for+phones+free+download PDF link annotation
    • https://hantverksakuten.se/ckfinder/userfiles/files/dupogeket.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/nuwimika.pdfIn PDF document text
    • http://vejwun.cz/images/jafukotifumabakaba.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2692002b1---36487338211.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/nezolutu.pdfIn PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/duwefuwasuwegukage.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/nowegijojojurokutetijamav.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/17538613960.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/7890749484.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fonad.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/wupomekokolezeponajakak.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/walanekufobazuvot.pdfIn PDF document text
    • http://runo34.ru/attachments/file/manexewerolofolaleju.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151864630c78---38021812593.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/6837720946.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/nofolusepukopefanaja.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/23446053455.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/zutirutuxizusemezedidok.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/29718221196.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/51022689117.pdfIn PDF document text
    • http://zaiger.ru/img/file/dabutuwiw.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d84d20087---3382439277.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/59300760055.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3e5f4968e---tegodamubisapiwudilulewu.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_off0000b366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 10916 bytes
SHA-256: 1ac142bf335d1347cb92f670359ac4af97e3abef2ba2bb724acd43645c3acd74
font_02_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 16812 bytes
SHA-256: 0de2ac711ae15cece9986581bb8ca79848e1a2c9821e27109d5fee97d30f1795

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