Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91fc35c39068e86…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 17:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf9ab7f36075265ec7b2e6070d11532f SHA-1: c8e883d082f007464d49f9082942678733bd00fc SHA-256: c91fc35c39068e8648fcc608bc1d30213d741b477a968a41bf33d38f98aeb6fd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://beaszemin.com/files/3274074233.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b48f93a8e0---59464089707.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/83787061417.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/wikomebipubajejupekujoja.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/35225696268.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/vesokikujuwasotomovu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/xiwakanimolejutusupolame.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/13505706439.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161500ef8b6d56---nisavifadebik.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/tixuvaz.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/99675557185.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/jemokewakevesimufubano.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/bodig.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wemipamolevaxexe.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/65630981893.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/48212684907.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/99347385270.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/vetagozizake.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/nirulofemob.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141530d26a1f---besiwivimizadususaxuguwaj.pdfIn PDF document text
    • http://edeins.com/userfiles/file/wutugebofojodowaxufeza.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/49704150174.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/92400910970.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b419d1f60f---vasamudujodusepafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=get+bazaar+apkPDF 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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 10044 bytes
SHA-256: 8d36a4490667a77b83d465d84e5ce7085ada09cb3612f811ebc7734c37d0039c
font_01_sfnt_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 15104 bytes
SHA-256: 959c1e3d57b1a3df8261cd5b8cbaa871a1ed018c762e5674dcbe8de4d5f12ce3