Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16bd984b4956915…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 10:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6170d132b5de8a6af5e9e2c9a9c29f49 SHA-1: c6e464d251a6ea7593839c31f7ace134447d5e06 SHA-256: f16bd984b4956915a0be07f3f4a48f059689ec2f15061feff0ee0528cc0bfa2d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://medvor.ru/uplcv?utm_term=skyrim+after+defeating+alduin PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eca79553c---munoweje.pdfIn PDF document text
    • http://babamoleskine.com/files/file/witevesopajulemibukidu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d83caf1fbe0---61200158513.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707caf4d289---66347976903.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609171409c327---62679760769.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6e7hkbu9v9b3rdg7jbpictcfi4/duwulitemunipakip.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/5980645178.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1ad810774930ebc70ecb19b99386b3d6/mebifavakebogibim.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/safawenuro.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f08c2e3a904cfa4f8cc268b8ec82b444/dituxovapalobatunememaw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3ge38m1lq1jjkundueu7hlpfj4/romuvodepisesipop.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gatavekomavejeke.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6ccbce9f3---10737033462.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/gonosopex.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff17a760351---55411683746.pdfIn PDF document text
    • https://aashianarealty.com/file/98481364286.pdfIn PDF document text
    • http://c-amc.com/upload/files/bobatifukotevolunibumefa.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/77109999314.pdfIn PDF document text
    • http://blueyee.com/upload/file/250858221350.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/h6gp9oda1ljnnebodc6afp0aub/lapavosotubekefunem.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e4686fab1---16126119985.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/11204823788.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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 17292 bytes
SHA-256: a9eacb6c7386e6274a6f712ef44ec885d026c08464a983f9e0072b63af476d7b
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 10788 bytes
SHA-256: a01d9e0739005d72c724b6535632f97b047c622a670d23f49d112f5f994d4e2e
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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