Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdf4a38efcdc069…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 09:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ac5a2d7c50e032e2ceadac721fc276d SHA-1: 0c786a1ed49b8b6408353a85ba74a2b2516ce678 SHA-256: 9fdf4a38efcdc06992236e070a05d247f105724bd90b502cf0d7e15ac3c9b695
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, including one identified as a compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent to host or link to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sportuna.be/ckfinder/userfiles/files/xodupekolelesosewavubagum.pdf In PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xibalefuw.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/549ff2656bcf232138c531d600f799c2/mixuvanabeziliviromodido.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/72217428771.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/xukidalo1621117790.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/zafipurukob.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/26429197561.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1099f622ccc491c6167d313fdbddf53e/74519636434.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608216cd23c26---kovetekowezuzasuwakavo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc53b87561---jaxegizugudizofusewemevo.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vqvp6tost800hc9qm6gq8ledrn/sopusobimakif.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/25047142319.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/39277619703.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09d820586---mimuwopepujeduwugufetabu.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/mekeserazipiwewojive.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/fagizixanasukejel.pdfIn PDF document text
    • http://allycatering.com/userfiles/megagariwitefakudofipaxef.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085279826f78---75293401963.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/11324343287.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/56295449642.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160807313a25e7---85008717956.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b89c6727---16641430214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ration+card+application+form+uttar+pradesh+pdf+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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 11116 bytes
SHA-256: 7819d3996296760f784a26d8e95ab7323eb041e4e23c7eac8b0e188de09fecfb
font_01_sfnt_off0000ca89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 18140 bytes
SHA-256: f27c70b7d30938ea8178bf8dd883ce7feefbe065a1094ee8fef9254f8f9ee8f0
font_02_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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