Malicious PDF — malware analysis report

Static analysis result for SHA-256 a422eaec896f9fe0…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 18:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6451f7e30eac29055ec13b2af85e5945 SHA-1: 1530e2af0693166280473979cb9eb77e12fa760b SHA-256: a422eaec896f9fe02a827d60fde0f9389c2c557998879365cdd373c9df5b3d23
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to obscure the ultimate malicious destination. No scripts were extracted, but the PDF structure and URL patterns suggest it is designed to lure users to malicious sites, potentially for exploitation or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accessprecision.com/userfiles/file/82125577002.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d056e298db---donufotaz.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/wemidujikexevoxajilelon.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/2e4435532cd34605afef55cd3f74d874/30866695778.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/78e89f5369e9525087e5e97df504a8bc/lofavujotevuvavuxizu.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe709eb376---1079113534.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/al3a80loqj3i0bh1p60a6sioj9/lulilapedoviraruduzamomob.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nig37b4s3gmp42nf9fr4jgeq97/jegux.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/pip9j3f0pbhcujulbq7v6c05dl/10683070112.pdf
    • http://dietmoitangoc68.com/upload/files/39680739338.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5457cfbfd48d2b3a8b64fe3245f8aaf9/jaxidokexakisisinixonim.pdf
    • http://techniq.ae/admin/uploadfiles/file/35653062065.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3sd89u5b30vtplhi3bl37k9603/woxifusejemixisozanogi.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c296f608a9---14844726790.pdf
    • https://medtek.vn/storage/file/gujovuxulaviweduruwemeri.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1b2b5f49823458833b52707affb0acfb/75761104214.pdf
    • http://hitecds.com/userfiles/file/8488472674.pdf
    • http://agcslohian.com/userfiles/file/xiweki.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607162f13270c---49522020125.pdf
    • http://augustaelectricalwork.com/editorData/file/30399269930.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a01b8a0d---rogadodonebotevexidumo.pdf
    • http://www.asslar.de/downloads/8323948213.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078f095a1522---jedilevokodofivo.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6aefc861e2a172e838143ef0bc038d83/tewuvokamubebadufed.pdf
    • https://livre-art.com/ckfinder/userfiles/files/fumafukinu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=always+drowsy+causes
    • 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_off0000f620.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 16792 bytes
font_01_sfnt_off00010e37.bin
7b08e905e5d91b457e2bc50e71731ed03a567c7ea0cab3f43992fec55defab09
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 10352 bytes
font_02_sfnt_off000125d2.bin
9dbfbcccf72c2f2dd53bfa5aa1040b50093b07297ff5ee15e6e0add24021d571
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 16832 bytes