Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfb70c018742a10…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 10:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3127a5db88cc0f557689eebd318df91f SHA-1: c2e0631d12fef18c9d9c660b6377a2969c8e4de9 SHA-256: cdfb70c018742a107360cf759bbdf52e9de5b24ef58da2b2fc9c7658ed705cab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to potentially harmful content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/06d0b223e255c7df879c59f016b4d0bc/rasopuwudunamizivip.pdf In PDF document text
    • http://powerfalcon.net/uppic/files/rigewabata.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/81678382787.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/jefazafalowigigofara.pdfIn PDF document text
    • https://windscrm.net/files/file/wadurusetaduxodezasekan.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/vigijozunukesu.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/junesuvo.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/sakonuvoborujanux.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a00a2b07f---87026391196.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/48131578530.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/sawukikowuwu.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109020418522469.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/28857929239.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336ba34fe92---refelitoranunizago.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/67266616043.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/98588908607.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/zegefofonazafu.pdfIn PDF document text
    • https://resicolor.com/upload/files/71488263913.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/siguwel.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b3123de8---70638735997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ancient+china+webquestPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a4f19760311e90362f3f7064255fbf57/56402720892.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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 18580 bytes
SHA-256: 5535ef78483297240d1589cf048081c76e0d0dae4015f9ee544b69c3cb02f4fb
font_01_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 10512 bytes
SHA-256: dfabd9df406a01f5f766b168336e066e48e5de913e5c17c043606bc090dd34ba