Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ca169692df1b99…

MALICIOUS

PDF

78.7 KB Created: 2021-08-29 10:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 55491ec2eaf8049210241318c7b452dc SHA-1: 996290a44669cefac2fb2d1ce3af26737b0dfdff SHA-256: b2ca169692df1b99f1e860a2ef8befce4c89d0052a4370a69232d84f4c090e37
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or compromised, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also strongly flagged this PDF as malicious. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=intercalary+in+biology PDF link annotation
    • http://gachbinhduong.com/upload/file/femenafesop.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/50555706882.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/tupasuramawolep.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/zazebe.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/13195384658.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/ladesunufavowexuraduvili.pdfIn PDF document text
    • http://orem.mn/uploads/files/jawaziburewofu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16122063d23874---29449081470.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1e59cf27---32501936446.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/66446523336.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/47745493630.pdfIn PDF document text
    • http://erictex.com/ufiles/files/loxifunejigi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608597056187d---sebunuratanimab.pdfIn PDF document text
    • http://aimic.com/userfiles/file/madejarekitawatobafatize.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/1e6e6fc3812bb761103141919c45af6a/kalidi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e352ae5cbc4---42558591998.pdfIn PDF document text
    • https://denimder.org/resimler/files/nafebak.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/69044335142.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/dajijigovezoduke.pdfIn PDF document text
    • http://tms-operation.com/upload/files/ruvinumalovefanuwi.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/toxevasax.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080407966c1c---44897874171.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/hvtmcic1f28hn1ajlma7n3d4l0/28830810816.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b763ea1b528---gifexeduzapemonirorow.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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 10440 bytes
SHA-256: 38ca1ca07c18d63cc0f990269546c3e917bbbea8132d6e671d87cbab626ab049
font_01_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16292 bytes
SHA-256: 25b7a4348280e42ccc9412b97c2d68fd71344a638091f5ba9b804f5c49f7e115
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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