Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d262682390feeb4…

MALICIOUS

PDF

78.5 KB Created: 2021-06-30 08:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f6b4600e5ddc1dfcc8e7b784b0e65c SHA-1: a20d662a337dbc573de5e133d71f3c8ca9cf03dc SHA-256: 5d262682390feeb480fd99843589461145fb35a7078e91751588b981940b70fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to distribute malicious files. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9b08274a6---kubajemagejuvavigadoweket.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/gesilaxuvodemene.pdf
    • http://cerrutistudio.eu/userfiles/files/pobutapagewiwo.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/151d3057447821a7de49d18951e60026/67495089888.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c462f7ccc83---bowometorolomovawememu.pdf
    • http://kolaykanal.com/userfiles/files/52358603890.pdf
    • http://connect-senior.ch/uploades/userfiles/file/74616039650.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f024a71d92---28451493852.pdf
    • https://chp-travel.ir/data/file/lilazodatilusogevotig.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/473eca5bbc05eef670358f0a3b458dd7/78835544579.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6be123e4e---werupinepigaxuzawewifuf.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d22e84000---18831566701.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e65b1380e---43553646096.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9sn3g8u0nbla753b1rq2ijs1k0/betosuxedaki.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/62605d22f42b7d7d1261c71bd1af15d0/sumuten.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj0n6phsliifelfb6fvi6mu620/36997339151.pdf
    • https://ottenburger.com/userfiles/file/26752810217.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/330f8fdcc5efab8d13fb705583a2ee3b/19723865198.pdf
    • http://lica-mpt.it/userfiles/files/52165783695.pdf
    • http://fertilityupdates.com/userfiles/files/5353989932.pdf
    • http://clinicoral.com/img/userfiles/files/87620920028.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e4bd1499---19996227981.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=blank+dungeons+and+dragons+character+sheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8b.bin
7352af8df9d0f72dabcf89b43f6c72e849b9160018afb806a76e1952e27c43c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 17036 bytes
font_01_sfnt_off0000fc0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 16792 bytes
font_02_sfnt_off00011425.bin
ff7533cf98bb8ca6194d87333ba369567a76eaa60e02fdb486c34862f9fb7a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 10800 bytes