Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc5dd37924bd4e2…

MALICIOUS

PDF

112.1 KB Created: 2021-07-18 00:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a65e345a5ff6d65ec568dda5b9db649 SHA-1: d790a9c56a299da6fd91d351911d923e0fdf6b38 SHA-256: 5dc5dd37924bd4e22884650798d24f4477e3ea7fde09bc54cde2f0b175e5a925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160934832f28c6---93630936854.pdf
    • http://kayamedbursa.com/userfiles/file/73857553902.pdf
    • https://adtw1.com/ckfinder/userfiles/files/fagizad.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/55aafc6cd0831ceb211ae8fa831fae7f/65464782659.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e11a40f7d---robitipezazoguwazalibo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oal3vipfg9dpqrhfgv676j8600/zugisasalalasi.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lsk7ut4av5egqg0j8g20f5f6hm/vunoret.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca644bf7e---94187602289.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/18c4e53bba3b0c7624663689af6eb016/zananetugujanonexana.pdf
    • https://cornerstonelaw.eu/userfiles//file/94613809754.pdf
    • https://alshaabcoop.com/userfiles/file/6125730565.pdf
    • http://www.tokyomagic.jp/images/library/File/16639982820.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0hrram6qc7lg74h5dpq577bgem/waren.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ec18c864---96160365504.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609468d0024a4---xogodufisodoniruwome.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b033a47904c---14958207328.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6af4178ce9---terolopejomarorodafivaj.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/863cse0nt5imrc70f79ignha51/semadukuzumaxarofuma.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afd693791f6---79050083934.pdf
    • https://sieuthigo.vn/upload/ck/files/dafuvobewigotojorisepav.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vchj39nv7v213hcromgctg91l1/moresizumetub.pdf
    • http://coreaad.com/DreamDataUpload/file/61851310282.pdf
    • https://agronlogistics.com/userfiles/files/23897010114.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=find+polynomial+with+given+zeros+and+point+calculator
    • 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_off00014cec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEC 16792 bytes
font_01_sfnt_off000164fe.bin
1ffdb1f792254d84a1bf942d77fbb8c61922429dbe381f59760d78c70317127e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164FE 19212 bytes
font_02_sfnt_off0001986e.bin
a0c544e43bd4c26bd41d95c170cd749477e30521a3265f953076677e63377cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1986E 11364 bytes

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