Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7a9ae258f70275…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 22:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1af2246740eba6a27c69c7b88d207fab SHA-1: 6d72cef7f5ccf32e4a85eb848642db66e9053e40 SHA-256: 1d7a9ae258f702751ca13c210947f3b7ef73050f151fab9dcc8fc56b3b9185c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jlsxjy.com/right/UploadFile/file///2021091605555073499.pdf In PDF document text
    • https://interativacorretora.com/fotosempresa/files/88073405723.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/22942597833.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/lolumegimawowojewixiwuren.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/44378041480.pdfIn PDF document text
    • http://na3.it/misc/file/juwer.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/38997112581.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/26005869950.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/gejimigi.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/fesubiforupumojufasat.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/lezirakufurigenifotuvi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/v5aefk65jdldb5h50bf59qrd8e/janizivuwuzijew.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/fonomomoriwowa.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/21620677354.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210913141207.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gugupage.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/xolatejegiluzelonezixob.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/89495280029.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/ririrawalu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fefb9a7f---22680271378.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/98021257363.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614529397abc3---33089202138.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/zudumurawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=find+vertex+from+standard+form+calculatorPDF 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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 10880 bytes
SHA-256: bdf2b3b313081a187854e791909d37fe0daaeb6209864b9080d785298f84f8a7
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 19960 bytes
SHA-256: c1dc29e7b40e201fe0d3acade163337323102ce51bc63cc35975eef47cee551d
font_02_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1