Malicious PDF — malware analysis report

Static analysis result for SHA-256 737f6a9d53b62f0f…

MALICIOUS

PDF

92.3 KB Created: 2021-06-30 04:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfb213846e40c6ef4f59e7a41bf75ee6 SHA-1: e662ad8f52f905d97e4dfadbd80dd33fd66a1b3d SHA-256: 737f6a9d53b62f0f0180609361d9475f2e483456b84457adc0c9cf3a035d9b15
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to PDF files hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to distribute other malicious documents or manipulate search engine results. No scripts were extracted, but the primary attack pattern involves directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://ansatrans.ru/admin/ckfinder/userfiles/files/22914138890.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vmgvud8hc5uqgjn4gpca971iij/pewir.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/acbcfuseg67g2sq64hfavlgl50/dejesibanijo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/21648040433.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/27343284421.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/wapejo.pdfIn PDF document text
    • https://artenika.pl/fck/file/98584494693.pdfIn PDF document text
    • https://amblamy.ee/upload/file/bejujukojogabifonapural.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/33214572365.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607262eb88434---vorina.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/rorelugabewepoxanewis.pdfIn PDF document text
    • https://stopserv.ru/files/file/2532093597.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/c818l8uredp74u1ghphbid5rh4/nerolivagopakagukozebevu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/7760475522.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82d7c5fc69---jedofug.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/78521754520.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4567b9954ed79b0df321d660273818fb/70786660013.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/15158029613.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/28107a3c05d0bd48de0b1566dbbd4b9b/visibikagoxe.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/sekaxuwifo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3d88c778---24489999428.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/88e2f23676ee18f0cbd0c3dbef4b3d5a/lepumegakonuza.pdfIn PDF document text
    • http://amajyuku.com/files/files/95065634882.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/77804901673.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/dac63f6af2492a725e0d97dd21c9b591/43872038188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sleuth+in+a+sentencePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 10280 bytes
SHA-256: a3bfbf427f39dd8a097a60ee85908fa24a8ee91382428985211648d2c810dce0
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16472 bytes
SHA-256: 75e97b460cf2d3e3521bc2407be9aa0bae20b9a5562602eebc563f211067a59d
font_02_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 2208 bytes
SHA-256: 1d24159ae2aaa5e9ff9293767957aca203cf781129fd576bd81615a8f228f1b1
font_03_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 20040 bytes
SHA-256: 3bef43ba5beea87fa1976d75cb99ce737cb1d12f849b52945714631af1d2eb4c
font_04_sfnt_off00014ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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