Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a7b9dfe22dd854…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 21:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1ec73d02277c11fd6d2e6eef925ff56 SHA-1: 804e2766fd1c0dfb60c29d52568c88512dd513f2 SHA-256: 33a7b9dfe22dd85487d0c8074ad8f850faf536ee264fdcac6b72e869254cef50
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links and the compromised hosting suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/83249183703.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607608f5c10bf---taxodezikipiri.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e628f41497---wegimopegixapoved.pdfIn PDF document text
    • https://eternalbliss.net/file/nodatumopawivegovi.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210831023824122860.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210816040940.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dogexajikinogozoradef.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/tilodivorewelisana.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/fozukubijokivuxa.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c398e9f90a---kedodanurokumimovemu.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/bagaduxijanepovuxideroz.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9206535473.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbcf742fe6---tonumolojofebefudaritama.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d682b2f1077---tejajuw.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5241e293cf---kalaso.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/dutixajogi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3fd22a6f3257c437acc7768514380f8/fasiwujekasof.pdfIn PDF document text
    • http://zubrcup.by/files/files/motolabidido.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16215399811437624359.pdfIn PDF document text
    • http://balone.net/_upload/file///51635552164.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/71950103447.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/96020819638.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210905164406.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852fa48102b---36851108091.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162375871076878849181.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/16694243849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=edexcel+igcse+a+level+physics+syllabus+pdfPDF 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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 10980 bytes
SHA-256: c4026ab8d0ddf5cd140fc33a6b2499234e1ff1ad2cc4977693f8873773f15f30
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16424 bytes
SHA-256: 0766a1f0230c74f7da25d6fbd0d59a70ec3c28220cb2578ffb692b2736e55d02
font_02_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1