Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f61fae5a159a1e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 18:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66104027ab97eba6503bd27b956afb7f SHA-1: 981116ce5bc533d0cd5b0340d4cdd572cc7eb331 SHA-256: 41f61fae5a159a1ea0bae9e913615d7448c874e7aebe68982fc8f535bcb7ff7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution tool. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613920b2a4b16---14057880917.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/51803852883.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ceb8e23e---mamubamabutupibodawem.pdfIn PDF document text
    • http://theponghop.com/upload/files/sanuned.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/voxupifoxezef.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/51430611239.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/90150449277.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/arsi5rt5jqbvj318gglvo1dsr5/jezapibekebobusixofiv.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/wafabebeluwovad.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/59739780195.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/zudofuzivitakazoga.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/julumu.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/36134859978.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1822afed29c84922e54a2cdd8fcdc237/24365777837.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/84854048482.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/xaxisetopexodedu.pdfIn PDF document text
    • http://artio.pl/files/files/96252060389.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/13727188205.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210912190319015519ixt1o.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/zotizorerifixaf.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/72890379539.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/bepetepijat.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/repeweforiweze.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/sofakizamu.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/wuremek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=supersu+for+android+7PDF 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_off0000ba5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5B 10572 bytes
SHA-256: 3128d2570db1e572239fbb9ac5975d53a829f1af37757ded49d1a253e24f603a
font_01_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 15992 bytes
SHA-256: 4a0e19b59715182c87317d273b8bc2aa4dd0b97d15cfd717871e08091c812020

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