Malicious PDF — malware analysis report

Static analysis result for SHA-256 5253fabfe052616b…

MALICIOUS

PDF

114.9 KB Created: 2021-07-31 21:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6137e7a664b68739cb54f9a71cae883 SHA-1: 68420ef7f35d6d92d385b50d889e4a5dc9762070 SHA-256: 5253fabfe052616ba1af996666eaae6abeab8345127fd0d9561a8f26aa6441a8
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS upload directories, suggesting it's designed to host and distribute further malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document actively tries to trick the user into executing commands, likely to download and run a second-stage payload. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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://korea-seals.com/ckfinder/userfiles/files/37557347716.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/56b4329389ae2a63b24f1ea809e2263d/66881829357.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e447c01030---bulakigojutipezewid.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1uru5pej9pf054efq0npp5urr3/voluzujiv.pdf
    • https://sinhadventure.com/uploads/file/witijosozimafisedi.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50d9350a892c05d3b34bb0de58b4f8e6/12193653674.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1327fe53---95297425558.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c57934990ab---zunisizusalevu.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e657fe319ae---muwonirudivibizeberiko.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/15772050c5364061beedb7bd6b30ae1f/wezexuwuxider.pdf
    • https://briljant-maleri.se/UserFiles/files/36368494513.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4d40706f47b06fcfa0871abea5616805/nepimagadu.pdf
    • http://obchodsezlatem.cz/upload/files/niwidatedugimara.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/55139176568.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/06f6a6fdeec7649774b45227e2c88320/divipexobiluwuxo.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/zatigig.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/332ae07ce94677efab7093b8f4a3c999/34283617986.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/levaravukirenazib.pdf
    • http://scoutpate.com/userfiles/file/kubapiwotemosulijop.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/gevupalog.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2ieua46s0rep93mctgfk7kq40b/muxajanemefurowapatanen.pdf
    • https://ljlconst.com/admin/images/file/50759677483.pdf
    • http://ipceurope.eu/assets/file/28145710687.pdf
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/vogudeka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ballin+roddy+ricch+lyrics+az
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001531f.bin
85dd657231d5742a40fb6692d3bc57e0df3ace95990673dd41bff5f6e6be9645		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1531F 17324 bytes
font_00_sfnt_off0001316d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1316D 16792 bytes
font_01_sfnt_off0001497a.bin
4f1cd17fc09183b77e9d5bdb5d4ad85ccdbe2a48c3773dc888af8be01d52aa3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1497A 2156 bytes
font_03_sfnt_off00016d12.bin
460ab8bf0a439734b47854de2cfb6e47198579bed7076893c2bf586d422b4ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D12 22428 bytes
font_04_sfnt_off0001a4d6.bin
b4077b8dff2de011a7849011265865e4199370b6aac4e8875eeb654c9f79a62a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D6 10464 bytes

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