Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5f8f835a4f86c7…

MALICIOUS

PDF

68.8 KB Created: 2021-09-05 05:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48c8fa2d344ab2195bd88abf79a4cd35 SHA-1: dd8bafa8c743261c6a680da27afff05b4efc4be6 SHA-256: bb5f8f835a4f86c75a4425340644bb237565b061c877918893f787d047ca70c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or lead to phishing sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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 https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/blj34qps00jq5f32um9l3f5bj8/jejixonupatejava.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3427919b---pawasunamariforumug.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/cu9uq3sbf5m1f4c4ftihgv26m7/lalomegigufe.pdfIn PDF document text
    • https://cristalensi.com/public/File/48595605348.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/kibusidoj.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/70512936184.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dshkd85ulu12fhldismn1l2h5f/34880723590.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70663802666.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d4amj3sj2ive3sctfes1au17mt/39812577309.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/12163583410.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wepiwukoriwawazanibodopek.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/80897698396.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/414e4df58eb95450b89a2bc18acda482/96013370614.pdfIn PDF document text
    • http://absigorta.com/E/file/74476787892.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/suxawip.pdfIn PDF document text
    • http://thaide.org/userfiles/file/65209161837.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/sosopofavubunojuwosaj.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/99844462882.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/55547922265.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb77c1393---sofagedo.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/41105230930.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/22365706297.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/17288233866.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/084e8f1dec8420c9acdd0a611ac9f93c/87750982126.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/46959387161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ethnographic+approach+pdfPDF 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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 10536 bytes
SHA-256: 98301965bb2e644f6cdeec81364bc6b49a2d259af613ec50b5b29e31019c19f9
font_01_sfnt_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 14216 bytes
SHA-256: 80135a8d9d8d615480c5f3dc3d01d9b1ac1f59995d406c5ca91b2da159521412
font_02_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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