Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff85a2f251ea8e79…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 10:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a589a556b4a85065835819613432efe1 SHA-1: 03c5948ac9a774e9c9c61a8eac6965b9f2dbb480 SHA-256: ff85a2f251ea8e79161f050515c812a29dde25ecadc52915cba4332bb96920ee
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://taaltoetsvo.nl/userfiles/file/zasiwovelesanupalipenu.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a6f5431c4c6cbbf6c0f9cb25a1f13a49/19946273004.pdfIn PDF document text
    • http://yilip.net/userData/board/file/sufefusi.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/608216394.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/87446960211.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090701545473499.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/72032276321.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/97529823868.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef168b64a---29732416957.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/mubunonusane.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/degifisawoworewepumaxoxik.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/13243198275.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/japikazileb.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a41a2d6a44---75031653320.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/jtdb2n0pgl09qkme1ogg4pqd5j/3465145439.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/xowebofu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510ce3ad4c1---80341919140.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/tuzoraretoxipojekazif.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a16170bd0c382cb07818b1576c104489/lopobebipuxurorugonemom.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/zoligazusakibur.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vosolugonemedesikak.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/fejemikepufani.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3975a706f---gunefexuwagalokoz.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/sivovar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=american+pie+presents+naked+milePDF 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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 10628 bytes
SHA-256: c27183deace34555dae3c5f02e9a1e5da1240fb37ae7a290c3b594569f930932
font_02_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 17204 bytes
SHA-256: a34bbfebc53e9117aa9cc8adb89a2e162305506dcac34f99c1c06d3783628517

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