Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c78811b2f7c8da…

MALICIOUS

PDF

84.5 KB Created: 2021-07-06 03:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da5764ae10a434597b3f55d204615808 SHA-1: bfd701729006dc495200655f010c59247c6bc9f0 SHA-256: e3c78811b2f7c8da27efa3281541d021078585308e355fbed4ef00ade25d5480
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6nvqgo443g0nborjts0rvetdg9/bisavap.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fe2e5062110596566154a7871be09cb4/4069420742.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/nonabunabiful.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/vunobed.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/749066b3c8ccfaa7678b6a11b98cd868/81034588988.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085e1318adf2---96991238229.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d437a7cec4---60343842966.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/zokajadevosavejuwaka.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/26714193722.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7cfc6dcc---83759559523.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wipodutibukukebuwawijub.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/30395215575.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d2b4c342c38c7e8d62542060cb5fb4c9/kabozuguvadavazexo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9f3e06c---41879432978.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5ceed986---jofesibusiforig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dc9049e81---muxiroguri.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kinubopozobujila.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tidupeta.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b20e0c5a8f746a322388fdec26b6b035/70747005583.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/84262626303.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/lixaxujajubil.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ded5bbafb7b---zolaxut.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8eb61c2cbf82b85a857d22ab2d01b050/potebekomenulunitupagunun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=theodora+and+justinianPDF 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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 16904 bytes
SHA-256: c739c4a5da1a09dc922d6bc463a62827560049385e41ee2a098fcb6b218c0464
font_02_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 10492 bytes
SHA-256: bd708c705dd272e8bcc5957d8874d660ec3c3aa4afe2536a928cbfc39cda072f

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