Malicious PDF — malware analysis report

Static analysis result for SHA-256 f324f4c6e8e76e2d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 18:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce07afb97ef5d64dbadb2bca9ea6afda SHA-1: 0622985203fd30170bde191096a5349f146d8e74 SHA-256: f324f4c6e8e76e2d862b159831c78b34598e4b60650fd94e40e681b11773bf76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4e61ab5c3d70fe8bad977490a496df86/70071612398.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d235b91ee5b---devusakukaz.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/86089496737.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/dde5d87db561120270389a202b41b77c/luras.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021072414020341.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/lurukaru.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/22676180366.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qe4v5ssau7e17tprdo3v4clqaa/9273679752.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/86997290002.pdfIn PDF document text
    • https://activepymes.com/pub/file/mixibegawelomojid.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c7b19f4f1cba9a2b47b390473948839b/9153981433.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/193vtbumqorg7mdpokqklir3vt/5358414946.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/200753434812.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/28607456851.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/fonapozuw.pdfIn PDF document text
    • https://maturana.cl/upload/file/resogusonegagif.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0b50e32---22328613067.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/23480439185.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/41252818071.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/14686734596.pdfIn PDF document text
    • https://novitas.ro/files/96493996612.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/38401977233.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/32196871703.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a632a45b6---mevilifafufudo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6b2fd164e---pabapipifekunar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=depuracion+de+creatinina+pdf+2018PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 11000 bytes
SHA-256: d307c23672e8e52da84c8f2f1c9d56a0be7a74b331f93fe5732f38478d675a19
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 19920 bytes
SHA-256: 4a066baad5c016dbfd6ccca791f81aeb9741d3e8ab73a750f08ce536de0a9db2
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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