Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d72ea80820c13d5…

MALICIOUS

PDF

78.8 KB Created: 2021-08-06 08:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c83b07acbbc49af1f0be78a06c30a1f SHA-1: 9027c78c437eaad4ab663ec27369ff40f8b9ea97 SHA-256: 8d72ea80820c13d5066855e341d8154ef2a10a5711e21d71839c67b7d6e99717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=how+to+program+craftsman+garage+door+opener+remote+315 PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b683e0be50---sokaxodedibupebamovewij.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/nikakagigowurowo.pdfIn PDF document text
    • http://dges.in/userfiles/file/80445053899.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/e6ca59146f5ae75547b0574bee92cea6/15027213682.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/mugegusogix.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gupaviroxelelawo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a907f6d7f27---89521572526.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vemadopujul.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084794088943---wapidij.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/60fp2ogef7u33j3jupqr5apndk/xunakepireseburapenirup.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/65342044056.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0tt4q45qioa6p6tbadpttr9k12/fegevapijosetovokis.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/55369767377.pdfIn PDF document text
    • https://abeess.com/userfiles/file/88932396902.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/waxemupivutabinolupo.pdfIn PDF document text
    • http://jump360.co/upload/files/20210604135254.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/76217638151.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/51307372968.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/73056926296.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/83339495781.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebeb862923---zifisulawajirefe.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844ce728b5a---5979063644.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/45225916802.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/tlu4qad009ucmrv2h5n7km5jf1/29658658503.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/17335280237.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4c3d63b9c7dfa66fc7892ab7c3393d1f/15025164080.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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 11260 bytes
SHA-256: c4806b8c6b60a5f551cb46d8fc50d89153bae0496f7241b4509256060fa73780
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16056 bytes
SHA-256: d0d6fcd50630ff157b2e6dbbdabf2cb96c8ecba06a8e389ee84728b0ad33ba71
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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