Malicious PDF — malware analysis report

Static analysis result for SHA-256 583a49e32e4ff36c…

MALICIOUS

PDF

73.1 KB Created: 2021-07-10 01:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf45bc65d7e811588414f9ea95eb538d SHA-1: 01dee59aec3ca8381c976f47a321a602388e3ecb SHA-256: 583a49e32e4ff36c604877ab12650e668ede474704211f4489574cfc21014716
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The structure suggests it's designed to lure users into clicking links that could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5fb80b69---87006328416.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/088c185e37ba0decb20046f85fe93dc9/83843012224.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/95811654398.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aa2e46c99---nuron.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e1b72c3c---jozowaniw.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3f89b305---93898422492.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16078acb5a065f---kefurubuxeremonivubuwa.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c9bdb35b---88304817177.pdf
    • http://www.anjhimayath.com/upload/file/1146085784.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9873cbf6---tipofi.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ab513a574a8d5ad2db3234b07b257eb6/vigegudupewipa.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7104248bec---puwuwojago.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c65221dabd4---23693189958.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a756f95f033---dojanuwilesigib.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9609d3cab---52611158398.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73d147e53---kixevisogavoxulusupuwu.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3594450e35---xelosofapotimopamukad.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c379b3012---sunakeg.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/da2004000122b5ac6445073f0a7a8505/zabawomefopomivaditosefof.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabac3c36bd---91839468772.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/7c133ea3079d5658bc5cf652b694698e/82384840550.pdf
    • https://netlandschool.cl/files/29657004302.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7443c2a0b4---34858513360.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=if+syntax+r
    • 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_off0000bfcb.bin
d8416d6483bf125a0ebbdb562fe793c0759b8080b418230863ee8155b26cd3b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 9984 bytes
font_01_sfnt_off0000d606.bin
1cc0bdb95651bddd046b3818594f8df1e6e0d768064edd279b7f4fa289ca3888
pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 16016 bytes
font_02_sfnt_off0000ff9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes