Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad3a54d1bafdd86…

MALICIOUS

PDF

77.7 KB Created: 2021-06-27 02:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38ca32402e834c4b0b172adb87ad5f1b SHA-1: 6832f20ada4b59330b5bf20a22a3ca96eef1bcda SHA-256: 5ad3a54d1bafdd86befb103552b069ffaeac35e0da75a01a920eaf37e4bee857
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ricarda-allegra.de/userfiles/file/42183451436.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/75037724148.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fca6b89de8e5c9486ae1ae4b9889021c/60790195481.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1760a1a44239f3cba7ae9ec2fe20263d/45781772755.pdf
    • https://bczenekar.hu/files/file/68830717314.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc64ab094---7152460337.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/64d416ca573644b89fc5bfead23293e3/21277477366.pdf
    • http://yokohama-model.com/userfiles/files/jetategitazuxerudazukep.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/38b60da5336f355057ef31b65f6feb0c/74663409765.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9560b5b3d---wetimupitu.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cf34dfa4d---faduwilo.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/k3c684582gf754hggtlmq5mmmd/8646886282.pdf
    • http://kiavysocina.cz/UserFiles/File/81733574727.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de32b5776---39736554363.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/87ptqv4mcuq928236ce11sd0a3/54437797889.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4827a7c77---tadipiramodirogare.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tttbj4fv7vaskbf5i6kgm15ctp/27107648586.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f1acf0eb---68553424317.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/bozemotabolanarofozog.pdf
    • http://barrospizzadb.com/uploads/files/bogetenikeji.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea56d906f1---37179314206.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/22893ad539850a80e57abebb69486c42/29809681749.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=husband+and+wife+jokes+in+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 16792 bytes
font_01_sfnt_off0000e358.bin
1ea6c0957308d83f8eab4e0fe3a9e45503d8a56ebb89431a43b02ebd5427ba7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 17176 bytes
font_02_sfnt_off0001104a.bin
570220cbe7cbd72e160c0d4b51872634976d041883725d2e874b910e84ca2b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 10952 bytes