Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9262080539ab6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 00:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6162afc7a7c83465a22061e6ec0b959a SHA-1: fd4538fc01e0c02a9aecb8406fa66d100d63719e SHA-256: 61b9262080539ab6d4a5785cac0f3470ecd44d07e0fabdedbde91fd8db54d9ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous external URIs, many pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=small+shops+to+rent+near+me PDF link annotation
    • https://combrooncom.com/contents//files/96707219979.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/97384450622.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/15915737865.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/20715640080.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/nagunubilikafuvexinaxabib.pdfIn PDF document text
    • http://schubert-hh.de/image/file/ligeporivexakozemepowoda.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/57713ff0aab023a5b80c92aff4e9b100/73559654937.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7939d3761---56802626969.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-30-04-50-31-9M2V1DAt.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfa142b595---fatomitoboza.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/zumosupiluxerumirike.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bce7840244c---37723646715.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/64293122756.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0cbe626d---sokarabarujuliresikodebar.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6ff829f6---97949034295.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3301e1f3---39133006435.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/rigegidemuvuj.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/32888399269.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/55589367910.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/32861369382.pdfIn PDF document text
    • http://tai-group.com/upload/files/88906306826.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_off0000bb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8A 18820 bytes
SHA-256: 47d71d69d95bf4d5061166747c91cbd8d689179188969010f17a01d1c1658073
font_01_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 10500 bytes
SHA-256: 27c838b00a08c8221b6451ae121c97381de82b2ff04b563da1a64fbbdba8b926
font_02_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1