Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1592dc73e6d27f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 02:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42aa4885293d48790d73b8cbb3685d7e SHA-1: 7dbc3d8c1db66d84a82b43154e24d82045953041 SHA-256: 6f1592dc73e6d27f0341f8b592d036437b85a4589740201848dd80aeccefe9c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links pointing to various domains, some of which are identified as compromised CMS uploads or hosted on disposable domains, suggesting a phishing or credential harvesting attempt. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zdrowejaja.com/Upload/file/25225853568.pdf In PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6f7336e27d9b466150dd596687fb77b6/89577336038.pdfIn PDF document text
    • https://x-software.cz/data/file/67402060295.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/57102982877.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/9992665531.pdfIn PDF document text
    • https://autopratichesas.it/file/mokaginizipusunexanub.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/sajipa.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/31acgt2k91hoi4kblm75h6akj3/gulunut.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/59216299645.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/kamikade.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/45746777243.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/59686123596.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521b4dabe5---burarikotelin.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/33163642419.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-15/20210815074537849775.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/76234731467.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/zutezenura.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaeecd381c---28963435375.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/dopifuwugekakamumasog.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/76998621025.pdfIn PDF document text
    • https://rcot.org/userfiles/file/35780590242.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/8298f03a3d5c41809a7c8dc11b298d80/loresazofigijanewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=oug+80%2F2013+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4f6a1b95---70997310929.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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 10484 bytes
SHA-256: 730dcdec36f69e8c970bbb646cb2683f7569a73e39dff99d95ba013560480cf5
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 16912 bytes
SHA-256: 7b952afb34bc7d2878496b85a386ec129a646dc8588c3c8dbbbfe954eb06211c

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