Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16132f646029fb5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 18:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15fffc99d43dac52729823b5f8e64c02 SHA-1: 20beb7e3ef07c175edf0c4c939e1c8ecbeba8fcb SHA-256: a16132f646029fb54685f3b9e69951d793aa17b07f4c9ea577e3338ff42215a4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/438bd5c8fc173df02f0f7d3de1b001f2/sanosefajusotupekanike.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/56vh9qjafb00nl57m8bg8va9hm/xobifarivalulirelu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/74655798829.pdfIn PDF document text
    • http://poiskvod.ru/images/file/7738794576.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a288dfe6a77---22429450933.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16087215b4ca9b---ratewok.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62211afac---45980638849.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8babb4219---51116534948.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641f50a8f1---15113603710.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/5d24a1cb368ae06b190416925967a97d/mokewitonesefofakorug.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/32436250968.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/47794780098.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/263ec6be9e7cf0f167a6ed1d422a7e81/dokesipakufolobotugozanu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e903cc94c09---papulubalaranebevu.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/724f6af77fe7af11bfbb619dd08fafcb/xerusujew.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/db09a9eafac49ca7f5c260521db40053/644419660.pdfIn PDF document text
    • https://pixel.bg/img/file/jamupikasixer.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/donusodizulivaxoxejijasiv.pdfIn PDF document text
    • http://pronobile.de/catalog/file/piresuwoposojewezovof.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///pivakowutojufonavitadoro.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/xezajewofafofenetekadafof.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/cec1aff4c31ff1832eda3f5bd54586a7/tegasefabajadovedowuj.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/winizibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=takt+time+calculation+pdfPDF link annotation
    • https://easyown.ddproperty.com/datas/files/63726979476.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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10668 bytes
SHA-256: 957369476071018394d76eb1b4a06e39265a9e770aff4dcf210d31cab726c50d
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 16680 bytes
SHA-256: 89b26075ff8853dcc197e0bfdeec9cec0938cddc22cbe3e5db3bee32e7e19d94