Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50096b04a365bd0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 02:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ae19d35400c3f2ecafab5450cb762cc SHA-1: 3230efc496c542ce043a64c79f0f1a6ea0849152 SHA-256: d50096b04a365bd0f9906cda727802c21fab24088433eac48bb7318997b4d540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external websites, some of which are hosted on compromised CMS uploads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search engine results or distribute content through disposable hosting. The primary attack pattern involves directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=bluetooth+killer+apk PDF link annotation
    • http://pokewaveanaheim.com/uploads/files/47461238055.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/lugagewojatidolebagajolu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/kopawuvatoxagegemudozoz.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/31033377138.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/mamiramakipikikod.pdfIn PDF document text
    • https://isosklo.cz/uploads/kuxodinebex.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c99e88bfb76bf0f6df085af344453cee/lemipisugefaxoburep.pdfIn PDF document text
    • https://tekartltd.com/upload/files/91543553722.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/wizopem.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/juvaruj.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/zanalita.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/dutaxujomexosojosebajuzoj.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614277813fcd4---ripilazata.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/86500508374.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/75022259077.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9846384b1---58179207600.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcc5a93264---37247699236.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/gikolelazanizodo.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/vaxenewejizirerot.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/tusazezomosiluwipofori.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/34676844045.pdfIn PDF document text
    • http://www.siposferenc.hu/html/21629171246.pdfIn PDF document text
    • http://exosushi.com/uploads/files/wunutufunitajuxavomaxi.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/51794317014.pdfIn PDF document text
    • 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_off0000b3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 10324 bytes
SHA-256: 32eafc0679b9830eec929d6f128a736125d4b02eb8f040e1fc1f5e33b2cc6749
font_02_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 17384 bytes
SHA-256: 1c4449955d5e2b9179a860f8d2360b8b278696f726a1c7739f10b61e37081ecb

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