Malicious PDF — malware analysis report

Static analysis result for SHA-256 866db7ae6667842b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 00:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 802a8159403b9f60b12c31c5a1bbdc6a SHA-1: c01a87490e6b18e331d3efa8c14c067c3930f562 SHA-256: 866db7ae6667842bbf3ac44668117ffc5995044692d030bcce7fc3729e66ef9b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://tragiaocolamsapa.com/userfiles/image/file/jimorudakadokelakok.pdf In PDF document text
    • http://www.wiz-fac.com/uploadImg/file/mevujotalerutik.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/titodol.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/43d0132a706fe5bbdb414fe50f0df616/58441778779.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d2d50da264fc092c39862e1fe91905c0/dofokatobulenar.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/buzorazo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e450aaeb10576f32b06ad9f386fd8000/seratewane.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/zolunewip.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8407165bbd72f590bb4767968303ae24/70133084008.pdfIn PDF document text
    • http://prosquash.by/data/romabutilud.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77140288cd---34581792803.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ff7470ee58cec610e499c20d62564abb/65738809361.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021080323085673499.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zudujadonajejak.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43a3e0e9e---tawotoxaxakodosotonogik.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc4fad173---3901488622.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/iij1e47clpklht2vil283h2vu4/xegutenagutore.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/46767202296.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/7867179631.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/duwixepojuvejirafiwejobat.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/suzosonaketutuwewodikagin.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f566fbd8c1---gubaxegugufalabuwanusuze.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/71054623926.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/sowikizub.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/62211227741.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/40801256585.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/nuziteruvaresaj.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8f24282296b918c92bded02e0632760d/wapibodemilujoworidazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=siemens+nx+10+book+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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10836 bytes
SHA-256: e56f9705fce1019571848f561a09c65b833d8fd0605d29232cc32cb2d8e30520
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 17680 bytes
SHA-256: 084aa8b6294eb1f7a21f23b342d8906f113c026ed5239c66754ef7896b03501c
font_02_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1