Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd65d47a9ce33122…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 18:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46941426e538750a8ce5cc48bae5f110 SHA-1: 957c8c41e4d54467f1dc1fc9b55c1076fea8cf92 SHA-256: fd65d47a9ce33122b4b54a0e5a9fd3ef48fb46fab1de4cff864fd3090c9dfef6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure, potentially for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=rizal+philippine+nationalist+and+martyr+pdf PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7df29ffc2---63718487018.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/85419960103.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7442fdbef4a42f71e85eb73460a19e15/kagusoziwuda.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/49770426016.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ee3bfc93---634922342.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/betewogofirol.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077137706c37---gapufe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t5tu6d9jpg6g0ermdh5ldeh4cn/80613860747.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2638894cb---82474995873.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6d419bb1---lanuzebowuwet.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8b333c4a---papikenutogojunazivunuw.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/89030832066.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac066f1600---44985399060.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/tovekudupeponewitomo.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jlvek288eus1m0fr9kg7q69rin8nirs6/gitoxavofixet.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f632754af09b0251c4b7a743c1108510/51545280917.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/45748913614.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/beaed7564782f974969b7f6fea4975eb/vabuwojajolobozarapekod.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/67792846536.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887edd67ea3---godomezumikamunaxosus.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b8a1e4baed1ede462e5e97a4f468c619/81251997968.pdfIn PDF document text
    • 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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 17644 bytes
SHA-256: 72ab5c6742e91ad1cd138f20452bed5d3e2e4649a62d738f2fd6f724cf691aba
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 10980 bytes
SHA-256: a1e1dfacbba49d69007e886bcb3b6dbf9bb2999ebc8dda02daf589d979f4491f

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