Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab66f121ad5cd20…

MALICIOUS

PDF

74.9 KB Created: 2021-10-01 08:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8687612410abb19fc827849af66260eb SHA-1: 28aa5315a63b680879530c0ff053b5ed3d7a484c SHA-256: 3ab66f121ad5cd20ac3c7e8bdbdc639d98559439d6a12aabd80464a917c1e035
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands or leverage system utilities, potentially to download and execute further payloads. The presence of multiple link farm indicators further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b562b8c59---84547900982.pdf In PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fisejodil.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/75440731222.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/13140149555.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d1ebd1c---fusejadapinami.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/68169812323.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a497e05fe58dd8164204932adf9001bb/1932456092.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/doxapagivukalipil.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/rubafutos.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/43012011426.pdfIn PDF document text
    • http://oilspecchem.com/files/vuseba.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/23928247436.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xatipopojuju.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/musadedufuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e9c5460cb---60111507971.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/93462014485.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/towef.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/28257615214.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d271f33ed0---9494446932.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/34496556946.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210918_150520.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73de227ed59ca95d3dbda0efd02695a9/bezuzovamogofubuvumaxe.pdfIn macro / runtime command snippet
    • http://vita24h.com/uploads/userfiles/file/88236883003.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/59132423498.pdfIn PDF document text
    • http://ty-universe.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pretty+little+liars+season+4+123moviesPDF 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_off0000ba3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 10872 bytes
SHA-256: 4e6d0e4049cdbb9d92041fb95a30584046c1b6a3be6a1dadbaeb334a2d8edbae
font_02_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 18676 bytes
SHA-256: e4daeb4c04a9e0bf96edaf640ebca1c48e1b6703a7e35525ef15d294c718a726

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