Malicious PDF — malware analysis report

Static analysis result for SHA-256 6835b63b8e95da99…

MALICIOUS

PDF

70.6 KB Created: 2021-09-02 05:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16d14550975aa40221bb86ecf253e5c3 SHA-1: 3b3dc2ae1298b08002e6d1d7e52c105272d2e31d SHA-256: 6835b63b8e95da99c521ba10dcdf2a168290d4ce7b808642968ddd7b9a6e1083
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of these links and the hosting on potentially compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 5

  • 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
  • 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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609113afdb8a7---devufurokapunatajiv.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958aa884257---kefogedos.pdfIn PDF document text
    • http://rayanchem.com/d/files/22386973429.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ddc134b96---24199813586.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/loloxuti.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/76020046685.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/272a7ecc1c3e9308f0c6b370abfcffab/koperuxirupoguxebulupi.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/49692209587.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/76927805854.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/kudegofuzidumasidiz.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/jilisavixa.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c094228b25b---40462894309.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/jazuvisaviraxulenixot.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/41751184667.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723c11c6634---46458986950.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160cced5e76cce---zagowenad.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/vqj6fm2g0lrk84rqqjip60i03i/59203134383.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f534a82f---30902690638.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096146c31b95---vekanavuvupefu.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/mulepogizitejote.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/galuxukifutemunek.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/zipodumepegurodurexisuzu.pdfIn PDF document text
    • https://clove7.com/userfiles/file/51989465855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=consumer+reports+best+suv+under+25000PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10968 bytes
SHA-256: f45dc9faec2175cbda5dfd2c4a3e0e41f24df57304a01d0da43df47ecd42721d

Open this report in the interactive analyzer, or submit your own file for analysis.