Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ae7a2796e64067…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 00:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c59653fb9a30f68059fab32547f2acdc SHA-1: bcecc05847df65be737979481e181540e9be7c61 SHA-256: 48ae7a2796e640672ae3cefc1ef5405b6f4405b0ea3c8b2fee77b935e70d62d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, likely to improve search engine ranking for malicious content or to distribute phishing lures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. No scripts were extracted, but the structure suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=empire+of+storms+pdf+online PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f2157308---jolerupoxuguv.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613631853ecbb---65009780283.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/67045002598.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sijisizuluvorobej.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/fafojudalu.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/52190561334.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/kikoxekigose.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24353090731.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/35295672435.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109140045101817.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/donixososexazesujagug.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/48609998479.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/49066466293.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/62001255048.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917044958104497.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109060749181966.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/batolaluvolawix.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/pikolimogumude.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/18598718863.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/71283009078.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/81307043534.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/kewakurajezotekukivodud.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qg9a5lhnbvd474fa2t2a9m1b81/28500801357.pdfIn PDF document text
    • http://bankerz.in/qpic/files/66368524310.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/difuxuleboxukolozosewuze.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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 17740 bytes
SHA-256: 3f70f9f617dc8cca845735d3319db55de07af382c2d0f0f4e588a6b5942405ef
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 10480 bytes
SHA-256: 99ae3d06e1098a88a7a1488c8329a4900c0b6dcce907ced2f68e7fc83055620f

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