Malicious PDF — malware analysis report

Static analysis result for SHA-256 920774ac5b2480d2…

MALICIOUS

PDF

96.9 KB Created: 2021-08-10 08:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ed78579a4ac11d9be17d3a0c027cf0e SHA-1: 630b05a2b5b79fa42b2050507adfab4031e59518 SHA-256: 920774ac5b2480d2f68079b943f47ee39ea84c11f99ae9d381307a13ae97a359
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=cambridge+vocabulary+for+ielts+advanced+band+9+pdf PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f4f9b36420---mujamonuxorifosejekinabu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/16609344059.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/70306943752.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160f0802b04e68---pimojusip.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/23677125683.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28cde477b---rutobubup.pdfIn PDF document text
    • http://tulga.ru/editor/files/22892673519.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f8c4ea8a---829246639.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/biwovagefuwexaz.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/kodopigigububonuxuw.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd38ae0e0---kavipuduzawajudonolisamos.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210717195328519.pdfIn PDF document text
    • http://furniture83.com/upload/files/49422180220.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd257c1bee---77356110496.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/602e534c55f8e56d32a4489244121d6e/bubupipunajepape.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/48755452656.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/xarudolokozodam.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/goxizezipopijulokuz.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/16333152462.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1c92afeb3ab62691be14ff462e887747/jifakudu.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/bugejux.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/90f3d07e42e252f94dd62ead921925f1/xonawamemugikini.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c442ce1de16---tizakezus.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_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 24420 bytes
SHA-256: 2df27659c0c613f915f65f405bbe54221368afee027f1250c94d16e8b5138a54
font_01_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 11580 bytes
SHA-256: b084279c23ddd98de7d151c3a003938c5de52c54bdd77942f393e70c54e1f6cc
font_02_sfnt_off00015a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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