Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bf1cb80e814cbd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 11:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33e2636669786af01ec2a8e1c654bcaf SHA-1: 8dbbc32e2b6c60eea875e3571ab42b8327aedbb6 SHA-256: 86bf1cb80e814cbdc26729d765abd40b8e75f4f911dc943295fa1dd79d7d5495
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chineseclothingonline.com/File/xibalijuvimapukezobunabe.pdf In PDF document text
    • https://nadrozmerne-sklo.cz/uploads/garosalamavowojisatesuxet.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/63840741979.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d9d1743644cd39a48d266f2444f0c9c7/67065171378.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2a1b6545710286827346703b442da896/91230035074.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/dasikevigurozeniwimojaw.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/jepojukaz.pdfIn PDF document text
    • https://camelcarpet.org/d/files/17726103817.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/78541015772.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/69209325624.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/fawovuzobewotege.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/924e63b59bed5a59c3a7807be20214b5/83645476246.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/lobinefixonuvewenis.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d95609a7c---xezixogewoleteleberobux.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/1394652509.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/ranedagubowapajovawoninim.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c220e758137a737af2a224b59e67eadf/98094443584.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/8178168667.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/wuwukovizovikedaxutevuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bangla+kobita+somogro+pdfPDF link annotation
    • 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 20940 bytes
SHA-256: b9699131449eabf1551cfccbe2751c5cc0f13a2d92590d8dd62e4e2196bce37e
font_02_sfnt_off00012872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12872 10996 bytes
SHA-256: f0dbe72da78db6429831b95e0370ba563e23c357c57049da680e2f6174057c00