Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f04b01a2a3eea3…

MALICIOUS

PDF

102.8 KB Created: 2021-08-17 01:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 481a1afe2512f830f20224d7a5b7f812 SHA-1: 00878b702d623eea1857cbbbd9299532f195a1fe SHA-256: 77f04b01a2a3eea352bfe5a09aac315ec455f4ca183b3a9c437bc8fb6c43eb4b
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a phishing or exploit delivery mechanism. Multiple heuristics indicate the PDF contains a link farm pointing to compromised websites, likely intended to redirect users to malicious content. The malformed stream length also suggests an attempt to hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://bkdesign.ee/userfiles/file/xowotikegipifugofe.pdf In PDF document text
    • http://baloneacessorios.com/_upload/file///damigokipovaloxodiw.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/nubezavux.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8ec9453d1951d4392a55f4450fd41397/kubejixamexodojowepuru.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/j8s6blvt8dg9r68gjgc66b2dkk/20366327967.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ff0f6a304---64918627664.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/bd3709d705653bbeb7152eba9ff1c73c/zijosoduf.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/nenetir.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce3077c0b8---genonuwofavisefisoj.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aede3ea5d3---xemozupijurawuteduxer.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161088b9218c75---kazituromeg.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/5746290311.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae779beef---62218397197.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cp8mpr2kdu448f1c9rk9an86vj/506786670.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/70480154152.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210706002851_p5es0w.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/51059530350.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/79422520569.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/86267884323.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/28436712624.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/10spikh00oqu60r67gbia67ae2/97815085705.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/21347743997.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0b5bc58f0b09f2510b041f073cdccf32/11283683811.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/15279588334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+start+whirlpool+cabrio+dryerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 18388 bytes
SHA-256: 21a54166434a3e3818dd93584cad046517d3dedca134eb4fe37f6d9d3c176254
font_01_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 10840 bytes
SHA-256: ef642c1b47fa1d441d829fbf5b8a8e4e493ac91f6802b5165c450230ef4622ba
font_02_sfnt_off000138d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 19560 bytes
SHA-256: c9f2cef7c38cbaaf1db0b15399fb8ea5275a5bcddc2d663de78ce9878c410172

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