Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30d249868b1e0c6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 23:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09c9370da9033f7d74399ce06fe0f3f6 SHA-1: 2b7da4c798e2132d2641376861d3d3d346385b94 SHA-256: b30d249868b1e0c69745eac24e6457ea0ec164f2de11816f71a957d785b6e911
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous unknown URLs suggests a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://biswasi.com/userfiles/files/rimoligijinixizuvavabaz.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/jawuwisudox.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607212483a510---86305814893.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf409a89037---sosevetidix.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vexadajurowotuzu.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/jidusofamolufufejidum.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ce28351c---60389335370.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/dadorokavuneve.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923574147f---60107096235.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vanuwesuwefigij.pdfIn PDF document text
    • https://avvocatoboretti.it/file/20689307417.pdfIn PDF document text
    • http://hodori247.com/uploads/files/28878319656.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd650c9a59---38961765388.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/30881175141.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3a82ce18---sovamowapulufagabiwimif.pdfIn PDF document text
    • https://plasy.com/uploads/file/57575161156.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62547e562---21623498691.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ivd1ofb79dr4anjpceq0me5q4q/2548049453.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/67428049539.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/33149380440.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/pinominofinalefefobom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rounding+and+ordering+decimals+year+6+worksheetsPDF 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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 11424 bytes
SHA-256: 55a3cb96fe4a9ec1a0dbdbd089faaa38ec9584d1603e0c18798339830b50495c
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 17604 bytes
SHA-256: 731e5767b5987c3bec5e7b630eeac4922e83498d5a96dff256f972546bf21125
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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