Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cebe47d7e882a0…

MALICIOUS

PDF

89.5 KB Created: 2021-07-21 03:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3954e19bde9edc165e3193d9688d441f SHA-1: df9f0c816b57ff2079c2a8f40de2d1361873465a SHA-256: a1cebe47d7e882a07149d91abe85d53b963a0dbf124f6a5ca2fa1c4de38c206f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URLs indicate it is likely a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c33138e77a399ceaf07ea93e7d1d5b98/piwadurifarukusamuzod.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160819bc0bddbd---87795486306.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6a8423adf---92978919532.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/fezoropufopijo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rfvmu38hbls9s0fks63sfirbrn/sopebililawofevar.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab8b97466---visabuvize.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/tifiwul.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadce97ada---99189242616.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/37220145443.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/lejikik.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2g507ute5nfpgqio6fjlvuslo3/7515130511.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7b7c2762---dusofatoxeta.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/6239881536.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d0ddc31a2533f35ad87fe1ec7de654f9/naxedabedesixaxezisi.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210630_DBD4606C31C53ACA.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3650e6efb9603923eec7bedd2803dcd3/60376824441.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xuwomosu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/hf3dkjm85gqrc56sietnnb7d0u/rujavixolibubijed.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2d4003eafdaad5908383a7a1c6f8c966/68920401987.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/dd8213b8740ae7f81428efd739a305a0/lizotagukewopewo.pdfIn PDF document text
    • https://seerupit.dk/assens/file/tilobujisowoditirosipid.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/tinapofojokanujakaga.pdfIn PDF document text
    • http://zerosquareonline.com/file/poliledigoz.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5c87d32e---93727067010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dry+chesty+coughPDF 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_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 16836 bytes
SHA-256: d0592908c3b4e54265f90b7baac46ff3adb00f62799ad4975ea2d49c88e4ee79
font_01_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14158 10320 bytes
SHA-256: 6c5a92edc15a444a0cea45e02dad53efc78d2cd5b6f1aea2fde4c3e0f01c386b

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