Malicious PDF — malware analysis report

Static analysis result for SHA-256 151e6733f145c6bd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 12:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 635118c3d5d155b0dd235990374f4f3a SHA-1: d9720154fde94b2e24db603983497044ae2cd0ba SHA-256: 151e6733f145c6bd25acc469098e2aee58f7ab113674f07c6ab659fbdd50b27a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to potentially malicious external sites through a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://grubstreet.ca/ckfinder/userfiles/files/wakenuxurilo.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fa0b83e447931e017e7a25d9b0d9cf8e/72944309802.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/73703152560.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/29319928537.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912152741902985.pdfIn PDF document text
    • http://orthodoxnews.us/file/pujedinuwejajiwazil.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164353b9b4---ziwobabul.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/kubanukivigodomedalejisok.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/38628778448.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/22779953832.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408bae8a3fd---mapebibe.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/92774683691.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e53b792515e1464b831edaf286dd4e9e/fedawasopofegetoko.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2ddb720249b62fc6546b6085b7e2f48c/65939018003.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/wezirabevavelozezu.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/47932260255.pdfIn PDF document text
    • http://kotolantopeni.cz/file/48288289740.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/dotatokaxabezope.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/75201250013.pdfIn PDF document text
    • http://sieuthibds.net/images/files/81434878802.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/47655548860.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391717ed584---pikiganozaga.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/funalanudavumutoxikubedap.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/33421543999.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/rovabasufiziduxudig.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131055c87c77---ruxitunigof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+untamed+2016+onlinePDF 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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 10772 bytes
SHA-256: 0976080cfe9d52934f628bf604f78612d4a4ea4b951ae0ff096a8a8d257bbc4c
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 18944 bytes
SHA-256: 885b2f721fcaab2c493c56f72a450b7899f894b4a4f9921d244bf4cc37cc6f7e