Malicious PDF — malware analysis report

Static analysis result for SHA-256 9576daca81dfc14a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 10:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d1a6f3459ac653e3d0519919123a7c9 SHA-1: e57274a88e724e2e2d5749a43da4527c7b5190be SHA-256: 9576daca81dfc14a06e18d6f39c5cc843f7e29c99f05b4672ff9b7651dddade9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=how+to+make+windows+phone+android PDF link annotation
    • https://monographie.com/ckfinder/userfiles/files/jitidenulifarejimedunoru.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/baxesutejojenabobigulote.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1525485642614010d824a18.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/77679230497.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/wofabipituziwuladezuvise.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/25218524014.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42c0db39a---giginalofozo.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/xejabedoboliluzizo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8f97c085---8075049923.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/50245656105.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/gamikusutuvuxuvimevarisen.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161447810164b3---jaminomis.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/42486005181.pdfIn PDF document text
    • http://wohingltd.com/userfiles/69752813194.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/netexoxuwud.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/57704968768.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/14505752855.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/fowinidotunujafaxofik.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/50948556582.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/13234300442.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vutikiban.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/tugemasonukusu.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/63299170437.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 18064 bytes
SHA-256: 078aa8dc4425d9963762bb141e0c5047fcb72023d53e1bf04c1dc15b540446cb
font_01_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 10780 bytes
SHA-256: d392483976ddc3e701995e05884ba06993df8f0c2bac981985b26dfda7e54b13