Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe88b5c12362e6d…

MALICIOUS

PDF

82.6 KB Created: 2021-06-29 05:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a9d09965d2154fb860dd33c7d8d6cdc SHA-1: 5cdbdc8cfb6279a38f59d96eb5361e5fef17ab89 SHA-256: bbe88b5c12362e6d9549b1c9a5aac36a25d2fc7f1e8f42d6ebc17bbccd20d8e7
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://alarmy-kamery24.pl/userfiles/file/59626150032.pdf
    • http://thermogroup.ru/uploads/files/letuveb.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/31118189237.pdf
    • https://rajakeempat.com/contents//files/rawatin.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d70c6b9395fde0beda91169d3fff7f79/funosomevu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f373a824---51339341567.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/aq5gss3qbe2rqp9o0oucengkih/ladupofagarufuxiruba.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/refame.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4j4ohuad15nilfdvsi49skqi1u/43425033006.pdf
    • http://palyavalaszto.hu/teszt/upload/file/62218010011.pdf
    • https://szekszardportal.hu/userfiles/file/marogididise.pdf
    • http://mvservice.it/file/vitovuvizopebusukikub.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9d6b2c1ec106fe3f38d08fc130a668d1/vujalaxu.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h1b04deni9oni65bk4nf20oftk/tivor.pdf
    • https://palcev.ru/userfiles/file/43548207257.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/gqlrqqmpkdlksjimi4dg8tvfr4/gimulufumefulanonenoridiw.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb9c13353---53906068133.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075062e141b8---zuxuvawazefebesiwowe.pdf
    • https://anukulagrotech.com/userfiles/file/gugosutupasa.pdf
    • http://infinivideo.hu/sites/infinivideo/files/novajabopoludorupak.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b59d5ae201ec330bfdbef6214bdced5d/funux.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d54be609---fenekubaravuviba.pdf
    • http://movementlab.dk/userfiles/file/87315961511.pdf
    • http://lasfyy.com/uploadfile/file/20210602224947721.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=someone+like+you+loves+me+too
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11c.bin
568925b41163e8dadd1d8eaf7e01ed358f5e11fbcce9af5266d245e84a8e435e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 10452 bytes
font_01_sfnt_off0000f8d0.bin
7ea90036ce49fc28392ece410923a89b73e0129a89ed8e7ff1c95e5ec1c0dd8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16968 bytes
font_02_sfnt_off00012526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 16792 bytes