Malicious PDF — malware analysis report

Static analysis result for SHA-256 826ddf27c7004e97…

MALICIOUS

PDF

83.1 KB Created: 2021-08-31 10:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc9178fadcc196e30d1a2fb6d659072f SHA-1: 28d0647f512c2688a5b5c9b6c0f6d742bf523b72 SHA-256: 826ddf27c7004e97f8d510229deb9fafb20cf1d6241dbc6981d7b082fef3e2ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate that this document functions as a link farm. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=how+to+save+pdf+form PDF link annotation
    • https://etonbio.com/newsLetters/images/file/fomigurevedosubil.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/55778164927.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/79572582547.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c3b29f397---pojawuxekuripobevadi.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/82952306285.pdfIn PDF document text
    • https://argumentua.com/i/file/28849872129.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081752ae5457---noxefixisegivilopolevaxu.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/jaroribakugik.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/sajowapuko.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/77141849621.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p0lr6e0hemvmcigvnjjltf7s90/guzej.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094c726842dc---92454963210.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5e5658fce0c0ec1729846b93b89bf9bb/xuzexuvaxolewezo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864392d88f2---97139538523.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/sixekerudojif.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ccf1a751b33143f17d333a7bbdb9126/30425848983.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/libure.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/df16f83762dcafe0e7bcdb6b967f9038/9394931451.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b42ab3b7---jusudojuzu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/towetirekirejetujawo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda4a81b4c---wemeg.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc6618965e---rexowekovuz.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/12658718782.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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10560 bytes
SHA-256: 7d1486446722b77deceb27eb09383a6045cced7f000dc5e57f20229fd01924d7
font_02_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 17488 bytes
SHA-256: c217df2287da0942131198faec92d36d288ecf395cf860a6192a4ca05a8ee93f

Open this report in the interactive analyzer, or submit your own file for analysis.