Malicious PDF — malware analysis report

Static analysis result for SHA-256 3348903844bf5ef3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 01:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b15f0f555b2f19bfaa24c009558b098f SHA-1: 699bdb6b297dedc66fc86662192d73b0ef58bc5d SHA-256: 3348903844bf5ef3b0c890b0766c9d299884cb1e07cebdeecabf6ce08035cd28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to external URLs hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to facilitate phishing or malware delivery, likely through embedded JavaScript or by redirecting to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://anaminfo.com/attachfile/file/rufifimofofuwatigemi.pdf In PDF document text
    • http://frankifoto.com/uploads/pages/files/dotinatitapu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109151400581283.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/34665055251.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/26179430592.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/wolamonasuweguw.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/36500809526.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/49062547437.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/5602041911.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210909_10469A515AF80D74.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/46452195765.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/19566224901.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327307b06b9---xolobaralixolakowusafi.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/24958486762.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/64908438376.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/teregolamafeta.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7a179998---sidawitumusarubusoki.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/76046401728.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/52823392445.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/tagetovokagifubogorun.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d42389f62a0228367933c043cee06ddf/tunukefajezaxofedurobow.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/munexagegufof.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090709195892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pocket+video+apkPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/gexanufigozafulaj.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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 10248 bytes
SHA-256: 267b6373a5cc6b189d959693949188061bfd8941ff1137bcf9482d47845d3b48
font_01_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 23184 bytes
SHA-256: 998ee9c0a7c35be3fbbdfe3680cac16371421a2ddf478575a00d088745ecebbb
font_02_sfnt_off000132e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1