Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23678971821f89c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 07:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 094ceda624440e1607cd17d23f5afe8a SHA-1: 35e657883efe530f45ba0f5956368724a1252220 SHA-256: a23678971821f89cc4b64d80fcd288d326fa86c967735061c46342dec3606744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites. This indicates a likely phishing or malware distribution attempt, leveraging compromised infrastructure to host malicious content or redirect users. The ClamAV detection and ML classifier strongly support a malicious classification.

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://crewmak.ru/uplcv?utm_term=guitar+tuning+app+android PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161527cec9a53b---zajurenex.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/nazoma.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd50dada2---pivuperav.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/8462352454.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210925_68742EB61670115C.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/62789941829.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/39364680223.pdfIn PDF document text
    • http://123dvere.sk/files/file/kogaropope.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/67400569774.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/bowabatitalor.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/zepemajotufifuriromubabab.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/5153471027.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/22693649860.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/84159604568.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/telavi.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/31e580b9c63ca8bb3e0c25a5851de613.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/90612617531.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614495545d4ff---22135073033.pdfIn PDF document text
    • http://eternaseguros.net/files/files/79772421897.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/15a283b3393d962b88b4641723b914cb/51167446158.pdfIn PDF document text
    • https://foulardfotografando.it/file/wapuvuniseririn.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/99974700712.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/tinekutenig.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fubaninefemopuzav.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In 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_off0000af93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 15392 bytes
SHA-256: 60e20780c0f18e6381cc286f22fb92a19bdddb66c1423b11e98325db1bb4e6bb
font_02_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10360 bytes
SHA-256: f9cd71cf01039cf265c53e48a6252b545abd3514145daee4e783515d6bd84e38

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