Malicious PDF — malware analysis report

Static analysis result for SHA-256 02855af37f01aef3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 02:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c535a535b996a127a5ea2395417236f6 SHA-1: f5e9a0b8c7d9b25d0c4ffb96ad41266640cf542b SHA-256: 02855af37f01aef358cb68a2a8fb668e39ed4d79b44252fd4c90f3fb8d3e7e6b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df81abbe99e---pinaz.pdf In PDF document text
    • http://fittbike.hu/files/file/witapa.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9672b6bd10---95699101728.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf69c6afcdd---5902128387.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf486594c16---rojefirozar.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1661e503538883778afd5fdb3329670a/83863425549.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/27174220050.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc96836f4---72649972619.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a923d9e4bed---99668973226.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/03ubm7sdvoirpc0fskhk32tnuh/jisikesasibudelazij.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/25974179881.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jimafakidasobuparup.pdfIn PDF document text
    • http://nenorm.com/files/files/fixefekojitolidax.pdfIn PDF document text
    • http://lex.tj/img/file/12162626901.pdfIn PDF document text
    • http://intergeored.com/upload/File/wirimininitezo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f233d86b1d---nejugebirowemolowi.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/14489005397.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/41721129794.pdfIn PDF document text
    • http://emannsltd.com/userfiles/7944963920.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pms6rh6g3f8osjesdvogkvbidu/67196495107.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/gexujugetexavibuxudupi.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/supemunefagenuwezama.pdfIn PDF document text
    • http://elm3rad.com/file/vomevomurofagoj.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5a45e471---wigazosidemaje.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/9283636027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+12+tablespoons+in+cupsPDF 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_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 10776 bytes
SHA-256: f1d8693375a8eaac7df20f269bde2619bfb97af321e00781cb8d8f2909c6ea2a
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 17700 bytes
SHA-256: 978a0d7aa789ea47c0ed3ceb51f58178eba02e48e87e63ea9bc200f3733b6c9c
font_02_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1