Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fc709b60a4222a…

MALICIOUS

PDF

113.5 KB Created: 2021-10-10 10:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3c3cbe8f64ad45448bf490be1c03eb1 SHA-1: 0276ecebc7f1984fd0d7ed158d452c1df06b1ba9 SHA-256: e5fc709b60a4222a9363c228ba049929666b308ad9410ffd951aedf9fe889b99
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=deciduous+and+evergreen+forest PDF link annotation
    • http://hanlacsclub.com/ckupload/files/92146580821.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/pimudef.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/60965595155.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/porigodi.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/wabafulofaxef.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/nakul.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/57604216316.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/80094426821.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dakebogirusoxulemesusi.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/8017975786.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab07cdd368---86689861331.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8cde3c94dbfa4c9c180458ace62e7ce7/munebivudajaganujidugeve.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/tigidew.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/vufasaxeje.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/15372510688.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/75140994449.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/jufekebotuvuvedapamuz.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202110030726075310.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2c24931ebb7bc87e9632dfe09da8c6c7/29696708697.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/wanerexuzepevu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/91577677977.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/84381411948.pdfIn PDF document text
    • http://minerva-collection.net/files/files/50912210176.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0bb69f169---dakavadalavinedorif.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/84869373693.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_off00015001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15001 10772 bytes
SHA-256: fb5fc92d9f7bdbb0e729102343b4ef19e49127adefb127be41ddc280eee075b9
font_01_sfnt_off000168cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CB 21632 bytes
SHA-256: c2d5825de88fa4f02b43e6dd560c4e37c2740c60d47f280961bb410dd0d80aa1
font_02_sfnt_off0001a09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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