Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66974dcb448e8c3…

MALICIOUS

PDF

85.9 KB Created: 2021-07-13 23:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7bf82f1a8ee7144ed99105e86eeaf726 SHA-1: c7594f623d6b799768fffd9744f011c95168b1f3 SHA-256: f66974dcb448e8c35d3b25b3b36b63f5ee778191b1a4bb700e736d6105f58802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or scam lure, potentially using embedded JavaScript for obfuscation or redirection.

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://smidgel.ru/uplcv?utm_term=anna+university+previous+year+question+papers+with+answers PDF link annotation
    • http://whatdwellswithin.com/file/jamezudiselojox.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vd015kk6aek4vepd4q2bjaj9b5/kowuxugozitaxewudopipol.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/37947420724.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/60752688856.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/55af0818acfb708c49868f34f62bf587/63347814490.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/93mgtmbgr8s7en22v07is092f2/forivo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/45656474198.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609306fe3d5ed---zebopifi.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/ziwugologulorupiduxav.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f7409f93b---96357029343.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3277a9b490fb2742da087b9ca7727d76/xolujagat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0511ce1c9c---wonamulirolepufatekugibu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/43397923792.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sirudedabila.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/76b6adae250f0915bfacdf911aed2313/37703033740.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/92514389955.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/5862426828.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607186fdaf6ae---99748502050.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7be222b0c2ad2a115040c9f928011f7a/wadeselatefakisozi.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/25479502924.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/58897993440.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2dg35un6ej31hd0igotca9ava1/87534405166.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a993d2dd---64529725494.pdfIn PDF document text
    • http://etre-belle.su/images/file/29801427337.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 10796 bytes
SHA-256: 074037922c2948d7c36c5bc88dc4220bf73c97b7d3ef436f02bf9fd31098b382
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 17448 bytes
SHA-256: e318e9ba10c964ef3495b3f7d37ae5a0b072a121c230e9a8ad8b1b1374fa35e5

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