Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9fccedc7b84237…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 20:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e497989f7ca76536aca5bffee696f5d8 SHA-1: 56e4595045daa16a3a51cd122097738bdb77d4cf SHA-256: bd9fccedc7b842370bb8b27018120052cb17fd9c9195945eb9f2f079aaf0f857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dadesigning.com/daduserfiles/files/35783993606.pdf In PDF document text
    • http://benetalent.com/upload/files/45409618434.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/nefepiwagaziwixiwosizikol.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/5829710977.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/65524358379.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/96168212973.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/85409924623.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o0lh2tqhq74t8asrr2hev4lsee/gedukobudekuzutezag.pdfIn PDF document text
    • https://ms01bet.net/contents/files/boxukino.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/60829023087.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/35129738116.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/pafifapisajebezexubaxul.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dulet.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nuriraj.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/96304896647.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/22922182374.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/zevutiluwalurinab.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/kosuxifuregokuzuza.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/28784993863.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/jerasafi.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/kilevuzosenuwetape.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/wurav.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d8ea6108---fivaxidusevuf.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141783a310c3---xevopivuluminadosukogaf.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/forejezaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=discrete+mathematics+elementary+and+beyond+solutionsPDF 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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 10988 bytes
SHA-256: 1f52b9ccc2a8f252a2240e0f7cf911534d043fec7018f9ba8c0ace3dbda5d3ff
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 17684 bytes
SHA-256: 8e9dd488e525d973a21a46466f5a2add4effe6d0230509f8a3328665a7e3bf5a
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1