Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a36032d18a25ca…

MALICIOUS

PDF

93.2 KB Created: 2021-10-09 19:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8f5db0ba5866509790b8a9b57158eac SHA-1: 9df28b32220f33fad467351b6731e566794a397e SHA-256: 48a36032d18a25ca437b896e6c25d2dcb6223466670fbd623dc7093bbb9e8d5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://cructi.ru/uplcv?utm_term=boy+scouts+letter+of+recommendation PDF link annotation
    • https://almuhja.com/ckfinder/userfiles/files/76824203839.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/53911588702.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/78163467969.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/vuxuzakowalibomorawino.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/sekorozezametaxavife.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/151105201792.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/posafejavo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c673362e3---31110621521.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/dinukolefudi.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/21712797693.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/pobesabeniguxozajagazo.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/34750282384.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/nakomo.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/tosida.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/35606911644.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/347485203.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a8ef1488---29831187219.pdfIn PDF document text
    • http://czminghe.com/upload/files/43673941120.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3a51da2da164010f2b16e795a746036b/22768472741.pdfIn PDF document text
    • http://med-os.com/user_upload/file/befuxijolu.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/3767286900.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/sipiwo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/sakujobawidew.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/at5pcpbs0e58thfta3vrrf0te3/12309629082.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/tafesawu.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210904123406_668401989.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/sulixobobijigedola.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_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 18368 bytes
SHA-256: b12202fad7f0d3e495ba2a10f448d9ed1e4307594ac4871cef4c2c9cc3d85aca
font_01_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D87 10904 bytes
SHA-256: 36b2d2cbb82fd57863d304b2a274648ad3ad1383b097e728a711c090a7a74c86

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