Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdba76fcbe654f2…

MALICIOUS

PDF

147.7 KB Created: 2021-06-28 05:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ed19cd9f867913c88b530f2b26ee89e SHA-1: 5899b0b8846e760ea34d43af3d9cd7dd43f13d35 SHA-256: 1fdba76fcbe654f23149b9bd2b2b74107d783912320aef12b1c3eec51e961579
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fr8bqstfbp6hocj3ntfkhpco53/dibusufepevewaxowol.pdf In PDF document text
    • http://vertracapital.com/uploads/files/25908844925.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/22409379033.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/54d3cca3c057b5cde111e379fc87beae/mefuxaletozenu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0vfbkj32p1v8af05aho5tdmgj3/78776573226.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/49127291888.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624762668.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/99702832081.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6otkuc1iefglhsbvtbo6il0i20/lanokitirate.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae00e42ed---981308382.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2624927b0---wudogaworatofominawi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a049ee2449---73254222727.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086f13a65a0c---xavorafosuge.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/1289938675.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ada9563c---gerulonofaxilozes.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/afc8c153fba6e3758061f465dc018b3f/36406888331.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pongvi2kll3bqm1s15lftle8bl/refukexupitekumana.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a072a122013---9852774829.pdfIn PDF document text
    • http://ippon.lv/uploads/File/30822299680.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7e50d627929deeac1b8bf34eb60a6268/lisefokanona.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/121ba45402dc4fdf9736ba3edc5a0112/debutudojetesupudokuvinu.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062806234870554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fundamentals+of+electric+circuits+chapter+3+solutionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B496 1872 bytes
SHA-256: ed98414ebcfa63c7d206afd5815adffb5c702276caef8da1a8253ca432b1c80f
font_01_sfnt_off0001be48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D65F 11136 bytes
SHA-256: e07faa24efee4cb9dbde0c46b157d40b7bf94a161ddb8fd4d58c0a24d0c127bd
font_03_sfnt_off0001f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F025 19232 bytes
SHA-256: 420683d341567899623b536392ca551e627a59432c0697e58a758702054f025b
font_04_sfnt_off00022434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22434 17908 bytes
SHA-256: abfc58dbcdad653916b4731834c7d90b309748ac4256a7253d3e6b7f8b25333a

Open this report in the interactive analyzer, or submit your own file for analysis.