Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ddb4b3bd98d259…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 17:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b56a632c89972d6c0c8946dc3410ed4 SHA-1: fe1ca86021ceb60d8142901bae955d59b8a6a2e9 SHA-256: 85ddb4b3bd98d259c79fccb789ca3a4ae12e7ecb287f8a81636d135285b7fdb6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many external URIs pointing to potentially compromised websites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://seoulsquare.com/userfiles/file/12180123239.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fee26663---zigukiwopu.pdf
    • http://weberstellen.ch/userfiles/file/peziroleloxalonot.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e95dd5dad---24856735817.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1acc85f1de3270b91fb8b04a6ac57447/11771766656.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5e21d801---borirobatosezisod.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fefdd9e9c---zunejugifagisugala.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4cf531768---rovarup.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5b33725b6d14e15ba68053c41e16c134/sebunojonudesedo.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e36a55f39---denisegiwuwunelodunili.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd30814efa4---46722937043.pdf
    • http://montaze.org/democms/userfiles/file/vadejavovevuri.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00322f713---bazud.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5bc21a82b161cf41b1dea4da501fdd52/88310598534.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076166629c03---jobililapezifas.pdf
    • https://airflow-skateboards.com/upload/file/biragozojubawuniburisaz.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2226e51f---50215029531.pdf
    • http://kyanite.tv/userfiles/file/zafemirinononege.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607509661da8f---90506700781.pdf
    • https://dobre-akce.cz/media/files/file/34653683779.pdf
    • http://obasekiestates.com/UserFiles/file/xitamofados.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0317179a1---wamelowivu.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca73ca12---sowetesebabadexutetadu.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27b434ff3---wavelitowosaputuwuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+of+luck+in+your+new+endeavor
    • 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_off0000ea3d.bin
2edf7d2693f565861887a2c0ec6b918451fd3b01b707484fcd0cd6d5040a6e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16420 bytes
font_01_sfnt_off00011486.bin
70061c0632386919bcc7df6a7d191941f6eb5d5522d4c0d30037a4185c6fba46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 10980 bytes
font_02_sfnt_off00012e47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 16792 bytes

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