Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0170d04fce1d79e…

MALICIOUS

PDF

101.9 KB Created: 2021-09-03 08:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01d4c18fe9d212b23b9256b264b3a367 SHA-1: 0a48dd2f337d40a4fbfdd6c62cc8cc8ac88d4300 SHA-256: f0170d04fce1d79e261628782558d5deb5d4b2ee4152cdb832ca22f9a8c42439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=modul+statistika+pendidikan+pdf PDF link annotation
    • https://yingzhaoliuart.com/upload/file/87861671672.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/valevokobobosidevagaso.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948915c76c4---nanizadanuvutobisotulo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611962051c1b0---kasejetu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e1am4r0s0ralljq269lhb150m4/vofexa.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/64665972100.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/kunazewer.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e45c5e4b36387734eab0a8e4cbad358a/jefokewavuliwakanufudobep.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/fixajewiwevad.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16116cda4e0e10---39668400214.pdfIn PDF document text
    • https://isleo.com/i_photos/file/jizeji.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/zamozuxurekavujujitinajej.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/jinazovagezirukope.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/4154080326.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/remixoduxak.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/gigiti.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e931e0446cc---70617009510.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160866d444eb5d---78171483976.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/71290669361.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a207529a46c---vewixekizadilufakivebifud.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/018e7ef63e0be487bb18a30f74fb70c2/rafep.pdfIn PDF document text
    • http://chikatere.com/Upload/files/75544459373.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/wuxidovijugejilokimiz.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_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 10576 bytes
SHA-256: 293e862644bfa4a26488b8bb067b4a56afa5e6f9af62c33b0135ad096c5d7a28
font_01_sfnt_off00014331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B43 17784 bytes
SHA-256: a67fe3bdbecfe5054f2250055484abe50a00c0c0d4967e58f150a7deba8a3dec

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