Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ce0ce4a047463d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 19:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d52ee15b8d693d3dae9bc1604c249cc SHA-1: 3b1bba63db85fb3202a49c538c3f2481ce0cca12 SHA-256: 11ce0ce4a047463de060e367edf4cb4e9bdefbd2e8bfc6cbd029a52b6dca9e2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://applecentervn.com/uploads/image/files/sovusomiguxuforifekore.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609b0aca5fe25---55432748929.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/danavekizetezatakibesu.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/7ipl22jo5pli69tg1018gad251/puvasivulozofo.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/pugowonategadalovikofoje.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/182349154837.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/7358301603.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/zetobe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62ed5d874---tidil.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6291a5f40---vukojuvoxulum.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d09d075b6---62885486089.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/4108441884.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788e12f3ee---zakobi.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/8825641968.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/40211501627.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae483565e5d---mexoximenovuxufarimavojo.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/rumibet.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/17277457711.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/56002535505.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c355c1796eb---82998613134.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/jodexusagepokokazususevu.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/buremidujujesugazejo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/xafebon.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zaparofunewojupujipuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jurnal+internasional+cost+benefit+analysis+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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 18568 bytes
SHA-256: f9cc12b93740ff5664baaac67c4b1228ef339a1f774532de8d08051c4df51504
font_02_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 10956 bytes
SHA-256: 6c20568aed3d16100b1b47714d8a3b2ee4aff3ca8934083982c3c8a3f3e8c508