Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dccff8b27e68b2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 02:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88cbf9f3206ff6dc1457321448484002 SHA-1: 7559ca7a10854f17179398476e3bc32abb4f4b1f SHA-256: 80dccff8b27e68b26035f5540b44eabfabeb524848ac3afa1878b4fc8c0c652e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. This structure is characteristic of a link farm used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1cd34cd8---78990972278.pdf In PDF document text
    • https://hanomanberjaya.com/contents/files/28501921126.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/ruwalubopasomuwilifusuz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcb63b600---kexagugepikajitasumo.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/malufurovegunidaz.pdfIn PDF document text
    • https://websbag.com/uploads/files/remakedawadoxuniz.pdfIn PDF document text
    • https://funbugs.ie/files/file/10056472080.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/rijulatabakizux.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/bufadew.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-8/20210908112814702253.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/72608569805.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a08b8f219---69754878519.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/wuduzudonunivisopazutu.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/ropul.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/luvijolupojuworud.pdfIn PDF document text
    • https://angkagenap.com/contents/files/61670601515.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210903142918.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/rafovipuletawiwixu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/50225776266.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k5imer4ksdm3qi26r3qljpr2nh/lesuzulumokederoga.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b174ca7---7773011123.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135386c256bf---jelopazejoloxerizo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8b5fd2ead8b4919837eefef8cd9f6b0b/97102670792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+import+from+android+to+iphonePDF 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_off0000ba0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 16504 bytes
SHA-256: b750cb4a1e0d8266a27f2df4f2548c779fce773b429fe9463392d08cbec753b7
font_02_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 10628 bytes
SHA-256: 9c1354c5755ed9283ecf8d9ad14000b664f96dd70fa0a24ab1df7f4c4d793a81

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