Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f30228a846bc810…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 18:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b090538a2d2094dc2d199806a6618cb SHA-1: 68d9c01a96e33bb954f5626578a8a971b1b637aa SHA-256: 6f30228a846bc81001d988f898493d785f58d3e342a58983e119d222cf6dee98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161382b07e140d---80358204218.pdf In PDF document text
    • http://www.asiacoservice.com/file/files/29860233546.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/98602127891.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/kudewamuwuroxodisaxoxib.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/88291689243.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/31303843227.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/romazawixelopidepewiwuja.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/48714725661.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161397ee2e5b96---fawodonapamid.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/donabivusu.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/86639894903.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182a55ca5e---zanexajapazad.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/kujisevunapavu.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/kurukoleloniputisope.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/bamonadakodekawunukabemo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/851e28e9aa463c920f7546abef5d7ca8/wexogurumijibe.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/74898659394.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/sogokixeburelenewime.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/wogajigasud.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613289152189e---77599217365.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/sapapadazelusafobawadid.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/59009622866.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/23243514133.pdfIn PDF document text
    • https://datenglagi.com/contents/files/papubeladarij.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dba6275e3---giriraxomorafakisobudapox.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/5111267438.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/15722332179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mi+mobile+software+updatePDF 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 19140 bytes
SHA-256: f0a3185438bf290e21a30f5044579e6de9faf0db6ef63fcf6fdd8c4aba5efb35
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10876 bytes
SHA-256: 5b99168257236992cd82d26ebd4d9a0ee44405f0ebd2ef3f439259b553433fe6
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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