Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22bab51f6e350ba…

MALICIOUS

PDF

124.2 KB Created: 2021-09-02 13:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8c2556e65ffeada72b30e197a4a6f2f SHA-1: 0797ecd18b00e45c47df169a072db792c759cb2e SHA-256: b22bab51f6e350bab51a93a50d7ba2dbaad662f293de1ffb858a4129691c73fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://drafthe.ru/uplcv?utm_term=manual+chiller+hitachi+samurai PDF link annotation
    • https://facades-et-traditions.com/actualites/file/50981696477.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a16dd2b030---46464104005.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/40424693408.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210720_123320.pdfIn PDF document text
    • http://suaups.net/userfiles/file/67742732168.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/welodotoxekawegidew.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/29140517984.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07iu5nmfqnl4p43vvsfljoikq2/6174579990.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/88428092349.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/panibupefopajipazumo.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/92608112483.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/47725851298.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/920d3368c8901ebabbb30c28c4bd3043/badalebi.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/98518590228.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/44418540012.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa8753f9f7---42763517630.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/dupepizus.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/jenapuselidokej.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/89275940057.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/mitesoweforopagonot.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/welodujulamelijotumu.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/sikujenozokaxu.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/88186018245.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdce06d68d---nemiwegebarisunenefuti.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_off000178ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BA 22288 bytes
SHA-256: 7bff026dcfaa1448be85d7505df564465f89f17e5be023d2ed1561044c186149
font_01_sfnt_off0001b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B321 10468 bytes
SHA-256: 5817bd0cd1287bb5c741373e9e55399c5e3feb21e4197082ec1fc795c4ae3dfc
font_02_sfnt_off0001cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1