Malicious PDF — malware analysis report

Static analysis result for SHA-256 1548538f222c34db…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 06:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e3918c851879876a429132fef76562c SHA-1: d887e6248ea93bcaf29dc3629bf74dac9d0de7e5 SHA-256: 1548538f222c34dbde7efedc0240421fa9147218f82569e703fd4c71ddd12110
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external sites, some hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, a common tactic for executing downloaded payloads. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://medvor.ru/uplcv?utm_term=how+to+reorder+pages+in+nitro+pro
    • http://www.ecvbrass.ch/user/web/file/wibun.pdf
    • http://indel.sk/userfiles/file/mijolomep.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/rakigazoxewigudo.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/20106523098.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7970ced3dbce17e0b7452d32b750e9d7/dupagizovitebaxepalok.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bed3a527325567615bc34717f79f6eac/25558374766.pdf
    • http://blpest.com/UserFiles/file/79527945854.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b505263fdcf---suzapaposo.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b9bebe83---zumoxovetedilejimoxisa.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/86tlshgdan3risaeqnn6manq7c/33290093930.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5e899b18c0fb73dcab44cc8f92d81616/varelutozalewe.pdf
    • http://piemonteforyou.it/userfiles/file/vazirubetig.pdf
    • https://ubranni.com/uploader/files/31904531043.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/65221248964.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4ue81b9hhm0g4ai0r2uff9n1q4/54583728481.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090057c7e07f---39061504274.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608310f55f2d1---gasifinumi.pdf
    • https://torbay.ru/images/uploads/file/56232420448.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc74cc82615---73104718010.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/05dfea5e2e81cb50488cf961324868db/pepufefagevoji.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba782245916---movazajepamox.pdf
    • http://teplolux72.ru/upload/file/bapesituxelifonoper.pdf
    • http://accessiblevehicleservices.com/userfiles/file/mosutosotekebativosav.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/13390146026.pdf
    • https://infiniteprospects.com/FCKeditor/file/30564856514.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d93c1852c0f---14493854659.pdf
    • https://alutat.com/data/file/63336779074.pdf
    • 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_off00010e82.bin
92709fe61127e6e04d06b0820e41500ce57c9fc97c948cc75011692c8d42c5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 10596 bytes
font_01_sfnt_off0001269d.bin
26fc058462a2cea0ff931ee1a48b519800a0073318733c143847e2d836122af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 17452 bytes
font_02_sfnt_off0001548a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1548A 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.