Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2af493ea7d3e5c4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 02:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7442c67cf0cdd34a402595d89dbcce2d SHA-1: f2fb13a6cf03be6cc37a15fce4510c70883a1ca1 SHA-256: e2af493ea7d3e5c4241e9aa9fbd2ffc17c04ccc9de5a0595bd115a941d19e9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics point to the document functioning as a link farm, directing users to compromised or disposable hosting sites. The presence of external URIs and link farm indicators suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=paul+gilbert+technical+difficulties+tab+pdf PDF link annotation
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/10250655080.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/25609607159.pdfIn PDF document text
    • https://puppometalli.eu/file/suvapodimilafemoworelure.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dofumovogutugodova.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/lefebenapizezal.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/fiboluxifewafizep.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe1103897---dirinotazakevax.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611df5d292b6a---75808658072.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/12436300038.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/ripazekagifodukizamem.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/53508425288.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/93adjoqomasn2ohblv18rhqqt5/fajapul.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/11172379873.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tokunax.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ba89d07d7---rubifopovefaro.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/33839197753.pdfIn PDF document text
    • http://hongdacable.com/d/files/kuvogelakarerina.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/78184778935.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/86051135392.pdfIn PDF document text
    • https://network-italia.com/file/15761159297.pdfIn PDF document text
    • https://superpart.com/files/mebisumegi.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_off0000b918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 11020 bytes
SHA-256: 46439fe463616795840afffdeb89873a2df2aa52913e982411339383ab22ad6a
font_02_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 19004 bytes
SHA-256: 7fc8555447e4c854f2d43a70c23d4f914225dfdd4e2ed4ae43f7e4eafb2de6c3