Malicious PDF — malware analysis report

Static analysis result for SHA-256 966796ef5adb1823…

MALICIOUS

PDF

98.7 KB Created: 2021-08-08 11:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 912f707ae0c1ac3b683433d129acd5a6 SHA-1: 31c0694aefe7693c0f39b1430209a2511680e2b0 SHA-256: 966796ef5adb1823f960b4fea4d8833fa98e83547aec04d76fbca43312c2bf07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The document body is heavily obfuscated and likely contains embedded JavaScript, though its exact function is unclear due to the obfuscation. The primary attack pattern appears to be a phishing lure or a mechanism to redirect users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6ff98d524bcbf36f76b9e0167614fa03/mabekurerozurixoj.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/tikikiloke.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wuzomukabujosepu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fugerudom.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/34489131614.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/33999107938.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210624_D12B11410768DEDC.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/44509248717.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/zimigijujufatataza.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b268a6cfca14653432df464298d88280/bibazi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8550a9839---16906682577.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c6d8d77ca943d2a2f2450bdfdc45db16/joxafibodamuba.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210523221202.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/tokegidukeriteve.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7jrjolenlhvniot5c4svn043h1/fodabosef.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0hug91mps3h9ruc3bg3coicuf/pidemex.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/10571576793.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c63ung8qbh0tupsc78shpkvlc7/pogemiselexazox.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/kemezajixumarowe.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/libarinisozavuwefifoj.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/vubotifusizorowapojobi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/21871834385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=100+frases+mais+usadas+em+ingles+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_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 19128 bytes
SHA-256: 4c302bad758c72452096ef4f27a6ea41d7d77ab9bac50ab21bcbf5e4493ce7ea
font_01_sfnt_off00014a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16220 10800 bytes
SHA-256: a7f0596adb30cf30806bd52148107357e1562dac64266db1a9e5f36942c8ca7b

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