Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0c7781acf7500f…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 05:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f480f24ec584e98659a7f4b4c365cc2 SHA-1: 009bac078128d8d58bd45d66fe8c001de80c76f7 SHA-256: 2d0c7781acf7500fc007825b501ba9ddf0480db2f007bd6dcfe7c8a26e36e9fa
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript payload, identified by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic, which is often used to download and execute further malicious content. The document also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a1906e58c37b94f74433d36e1adf7ad5/towalexudirobidovobozojop.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0c06f9e9---90171700093.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fi5v1i98ot8lpbukn0khg01lq8/rufatakuwuxevezoze.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/xibuzadivisowixe.pdf
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/rulixelelobumukejuripa.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/deuem88t2epa7ce9n0upe3buaf/53983094954.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ggame5q8q5ft59mv8ldaa3iki0/zenadotitigiduviku.pdf
    • http://angarakshaksecurity.com/userfiles/file/lozetevazidonut.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/a640hh1lrq8sn8et0718pu135d/pofuzanodu.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a61508538---kijuravakuzevafutugusi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d26bcbff2---tinofozojizax.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ca17b3c5---90128272272.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d0c16504---pekogigonale.pdf
    • https://dolmalatrek.com/userfiles/file/23497581312.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/36ofakut5bk89tlujc9t18s9qs/56276301641.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/133m0pm2fism5saiimsfecbfdg/mudosevimemalirotopuxi.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aba654243---30677161015.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c282670d7---goxug.pdf
    • https://hrmconsulting.biz/upload/files/nijixiruruzekifonagix.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54975eee6---52104177447.pdf
    • https://paklya.su/design/img/upload/file/bagozutoliwaxepox.pdf
    • http://fruitvita.com/files/files/93248575152.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quotes+about+math
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00015f01.bin
66a41d618963814d4e21468296c37e8e3ea856ee210145a3c9a0260d0031ca6b		 pdf-embedded-script PDF raw stream script payload at offset 0x15F01 1563 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).
font_00_sfnt_off0000f707.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes
font_01_sfnt_off00010f19.bin
b8daa1f565b8ea19964c6ceca501f531269a9ebb26b817ca94942db569fd1685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 18288 bytes
font_02_sfnt_off00013f79.bin
c92087dda69f2e662e5e7d69ae29744c7f790547bf32d4ca518731dd9db91d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 10332 bytes

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