Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae367455142a4998…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 16:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be88c3654dbc4d4742c2e74fd4dc1e1b SHA-1: c1022222c6af8044cb415b3867104ee8575f5134 SHA-256: ae367455142a49987c91348f61c0bd0a585287ebed7969832080f3b8879c3be9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://londonjip.com/userData/board/file/75343027542.pdf In PDF document text
    • https://argumentua.com/i/file/guwakumezafofamifux.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffddbcd124---zojajudumopixasul.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7764ea9da---22149720793.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4b49b400d8047064be975d5fdd7cbe97/nuwudonelopeg.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/dafiduval.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/80774379919.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63e8d70cb---8892039691.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a383f3d01d0de4c0aaef60a9864488af/33905421157.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c1fc8a1b35741acbadd00f013ac89d70/dotajudekipib.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/48377697136.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/susodometo.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/podojawusefaripuwisaja.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/90891692858.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/xibinojutawifokafemub.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/29556507849.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/gefoxeselowowaxum.pdfIn PDF document text
    • https://isleo.com/i_photos/file/88746733849.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/91051896422.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff821d7771---2562065756.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/51792468088.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/74029ea99b1c63750796bd290fbd8461/mefizojo.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/10283332459.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879da3b2506---tawikejez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=texas+roadhouse+drinks+menu+pdfPDF 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_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 10876 bytes
SHA-256: 5fd2b13a6fef050c504ac25a88fea38e607b4177a275ceb2c6973725bf0fbfc5
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 19152 bytes
SHA-256: 3da2f7161cd8a18f6a3a81f5e992f90bcb3b963068f7117980fea355befaf565