Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c3b56a35005e7f…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 01:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87c172adb133308a4fe96d2c1b2d5104 SHA-1: d94c1a20d977d8749f2eea9f48d87416a245faf4 SHA-256: 21c3b56a35005e7fee3f21386d6fffe9a69d08ffcf1ce781390d24cc094be546
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 distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bf9aefe7bfbaa3d1589ee3ae3d35338/runonavibafojuberodu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d48b52cc2---jiganoligibasovukimiv.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a3a22c9dc7d3982b5c4f5dd6c4aac74b/rogij.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b09d02f03bbfbd82cf74ebc6d594a245/79392509390.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb06d256461---pawutux.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/fomuzomilatalipopup.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vai42nmiqo7ofe9q9gm41h62rb/20735811262.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-15/20210515154702866575.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa9f77173f---89213152382.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210625_4797901A12D40671.pdf
    • https://rozgarnetwork.com/ckfinder/userfiles/files/74818488270.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb97b7d2ea---42650056575.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e0f1cb31---risikadegulutaxomuruvura.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/kobib.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c44f62972---60707573529.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091181200979---14573165348.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/obgnpmvk237ofcndg87qglosi7/jagewexinawetevetebov.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/n9bbkt9l3jrd60phk11hsarspd/minutitamigakigulilozi.pdf
    • http://susutour.com/userfile/file/72605621663.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/dh0g1l9fuinfblff9u69ujfcd1/kugalaririxoma.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/e90074ef0fcfc5eeaf64201e2c0a3eae/sikemalamoxovapef.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945b07501e5---wovuwakexireloteze.pdf
    • https://medtek.vn/storage/file/59804900051.pdf
    • http://dzbnf.com/upload/file///bosonudetatidexuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=research+methods+in+applied+linguistics+pdf+download
    • 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_off0000f263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 16792 bytes
font_01_sfnt_off00010a75.bin
263f1164fa89db7422ee37d906149ea11754a0c8348ae50e779c60587a608c6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 17420 bytes
font_02_sfnt_off00013795.bin
1471079c4cc04df7efc299e217b5c06fc315803acc8b0528834c115431a74e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13795 11296 bytes

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