Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fca8103b0c06af7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 07:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e54827c911e9f66d727b23515dfa4c71 SHA-1: d4adfa32eecfaf233b0de2dc94e7e5b2baf9926a SHA-256: 0fca8103b0c06af78a83e20b9db4db1d1bde427f41fd6828ac4fa88f3798ddf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.donboscovizag.org/images/files/fuzozokekanewoduvunuforej.pdf In PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/91488224432.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341e8959ef7---xizexakowivinesu.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/65197752126.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/60510532693.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/23250421855.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9d327763f---83245338097.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/fububilalus.pdfIn PDF document text
    • http://termocity.by/pics/files/tavisexolekenu.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/69701975365.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a0psv2bq55goafkrgeksge4cb0/8081402336.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/xoxatalived.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd12aa4b7f---61195415955.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371d040df51---warogesebekelurozapofizof.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/47447837797.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/33018925076.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/zibugurofonemotuzalu.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/wegeji.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gokimivivubosete.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/47103019772.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/pebosipugunogisola.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bbc339bebd5448847ac4993d32daf5be/pedomebepasipoxudokusam.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecce3d738---jumufoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=365+iptv+box+apkPDF 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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 17948 bytes
SHA-256: 8746c787d714776f1084499cef6c1ade7909a22d31659d55d3c7f9886195d186
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 10472 bytes
SHA-256: d6b826cd79c0689b249c433b568ee8a88bb76f0fca32fa7fedc6cf603270ab56