Malicious PDF — malware analysis report

Static analysis result for SHA-256 debd197e4d149345…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 07:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43c8c80f27af19a9302d6305a934b5c6 SHA-1: 8dfa4c139fc3293ac723127a5538dff18ab6f506 SHA-256: debd197e4d1493455daacb410e5e1e7ab2816c86b49a47056507a5a495f907b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612a29b2a1f84---saxiko.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/44de5ad9514ab5144639a3853c73f80f/likotow.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/73997314186.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kisesanisimudagodorof.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-9/20210809162433147597.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/61b1ce456617dcd3c32dbb7de539e545/80133666129.pdfIn PDF document text
    • http://gistys.com/userfiles/file/ditowoluvemu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/08b514d11d0dc16ceafa50b1746d9f83/56547377332.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/5726555916.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f12f41fc---dalokabagetavusumesom.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/xuririv.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/jupovefuzolomezizar.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/96724201832.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/runofetu.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/74209108758.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3708e8d13---jorafaku.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/gajudupolakowedixabolotug.pdfIn PDF document text
    • http://fxmeat.com/upload/file/701b1586f47ec097f892acf0f20dd849.pdfIn PDF document text
    • https://masihpt2.com/contents//files/jujula.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/dc8624cf11e49eeebfeff49fc047a3a8/88700367158.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • https://fallsplat.se/file/22857614145.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609539c9b5ed9---48200150632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cloud+computing+pdf+notes+downloadPDF 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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 11080 bytes
SHA-256: 3157e0964181ce2854b27df15946eb51fa6530798564efe1b3c333baa60290f0
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 16836 bytes
SHA-256: f0f05680da0d1e5f8ca1950ecf0a5cbda2ec0c17a01af2e790d93465e8cff02a
font_02_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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