Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8aa7ada4377fb5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 11:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 749d35eedf58f00bf2af2007280b188f SHA-1: ce6f35d7951f422740c406522f03fbeca9d5ec0c SHA-256: 0a8aa7ada4377fb5477269ee13b7a76d8f9f235e9eadb65a2fee7de38e126870
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, while some are benign, are part of a larger infrastructure likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://sooryasales.com/uploads/file/79872645884.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/31376900366.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/lezapenosilutuzujenaku.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/doxopidokoberulewis.pdfIn PDF document text
    • http://esistore.be/userfiles/file/gewede.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191153101718.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/92828846214.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/raguvexevewasadepetopiw.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gidinuxagiru.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909165309228308.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210907160707.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8aeada10b8be34f1ee06893bdaf2e14e/sunugi.pdfIn PDF document text
    • https://digireg.pl/upload/79510889358.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/46221505964.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fd76466f---xitasanos.pdfIn PDF document text
    • http://cartopack.be/Images/file/kefabubuv.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/fimazawufu.pdfIn PDF document text
    • http://12shio5.com/contents/files/puginanegid.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/63762006508.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614339d402630---5051584717.pdfIn PDF document text
    • https://chineseclothingonline.com/File/73659334357.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/28763512082.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/44809240553.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/1823625934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+revolution+apk+downloadPDF 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_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 21444 bytes
SHA-256: 68e94a50a0061bd8754cb6fc59bd0a15d3ef25e3e45c10b57e68c4deaa5f0587
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 10732 bytes
SHA-256: 66cb280c83301336d5509dbbeb0fe77169df0c8bbc0a8abbde3219209238ceb6

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