Malicious PDF — malware analysis report

Static analysis result for SHA-256 19307a1139155ff8…

MALICIOUS

PDF

71.1 KB Created: 2021-06-26 09:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfa5388640e0c062599f3a9e32125d48 SHA-1: 807ab8cdf54ebb5a9e8629953eb9704569d3b268 SHA-256: 19307a1139155ff87c70d3992451965f062d0ccc887277cac0d3367cc2a3eb9c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it is designed to lead users to malicious content or phishing pages. The presence of external URIs and link farms indicates a pattern of directing users away from the document to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://iwnta.com/userfiles/file/vizupojuzilawitoku.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/37a8b7786bf9c33eff40c2ae163343fa/98673396315.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jemure.pdfIn PDF document text
    • http://agrion.org/upload/fichier/zoxobaki.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/btm7cojmif745ld2cntf6lvmg9/gedoniw.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1eb0b998a5a08aeeab1341078da3d2a5/58205605026.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/50564099563.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a22961e1b66---lapugedalitewajejapaxu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7817ee5651---46658807847.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6fc4306bb9ee67f561f72faae9f0a1f8/buzuribaregeba.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/tebududuratug.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c161dbba22e---jewiwufeb.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a54431b619c396de870be7adde3f5674/1104456441.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7e521289---70847421793.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/88465918195.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160906627b5e58---57552561738.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab558cb9309---mupurosejapa.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/84566060834.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/puleraka.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/94225966720.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/0d1cb0711d1c3e2819e94a9b04cc5992/losesu.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/37b8666ba7b6f3de15e9680fdb0cefd0/pexajinimefesobik.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mitinofajijopelirafer.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rr77tjo6e0nimrcqtkg3lgreg6/22776215045.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/dbejalechhh68a5fenm3240ki8/zilidamarasufizedemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cost+to+mint+nftPDF 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_off0000b8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 9968 bytes
SHA-256: e6bc8790c16552975650647cbff4dcda7e602a02d8ebe4612afbc9ff778a7987
font_02_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 15376 bytes
SHA-256: 0936a9737f426ecd20af9e38d776f65a079c89bdb4631abd420ba80ff6bd0f58