Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f90b8aab559eb3…

MALICIOUS

PDF

91.4 KB Created: 2021-09-05 17:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cfc40f81b3e243cf2cbfb82ea1bf26e6 SHA-1: 29601375e1f26c609a9c1b6b4ee5f1a5a7ebf54a SHA-256: 87f90b8aab559eb3157072f7bbf02aa0a13aa4b3fdb458eaaa3a82b38d95b45b
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://elard-group.com/ckfinder/userfiles/files/nizokoxoxetam.pdf In PDF document text
    • http://boxshop.mn/userfiles/files/xenakawevukorenofe.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/22bdd2b4dc0a288bdb4f80d1fdc6375f/32588238246.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/tiwodi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cf5f37f16e75fa58c9b71b97d220b7e9/genugejunikofiwabunasos.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/88913971277.pdfIn PDF document text
    • http://bienbao.net/uploads/files/xujiboxerodizi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/43631034716.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2eb2b018108f7bbd94c29c07f7985e29/25726371738.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1bf134f4---sopekanusedimidedozamaduz.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/zezubar.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/maninifigapekonezesevix.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/fofixod.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/guguz.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/83974069227.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/gelirenebubesivipemu.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/87517635321.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/63205327416.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/90189373282.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kisomumorefabutapemi.pdfIn PDF document text
    • http://skomi.ru/img/files/file/50957920680.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/901067657.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/1132262788.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d593b58c89---nivigutelo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16094805854f1c---mimuforozosamiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=test+print+pdf+epsonPDF 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_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 18876 bytes
SHA-256: 71a6b51ce4a357ad143d155e4a4e4ea1708a17d648da9133fe26eb12a6050efd
font_02_sfnt_off0001483e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483E 10244 bytes
SHA-256: 719b99f5c97890056873b6876925f494371f739c55bcd3e8a2ab42cfadae4d9e

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