Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e525e037ee5f5a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 15:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1de01615941c2a0f798b3e1682c98406 SHA-1: 59349ad2b37f8aff7f85cd48b6a5f61398a0b7f0 SHA-256: e5e525e037ee5f5adaad8b4fc5548606e18db32127857c6ea655e1c19993c760
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cisseo.net/userfiles/files/47819623662.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc70dc736---176028384.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/40796400340.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c6ad9357---vajeg.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/tiluledipadijekimimilo.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/wemibijixojanolaw.pdfIn PDF document text
    • https://ka-base.no/images_content/file/fenifutoma.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fizotire.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/peraxisomisomomun.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f5e167d---53139317173.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/kupizusar.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/13004106340.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134400edf80f---42272008247.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/fonorufab.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/suval.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139296acf049---78595353384.pdfIn PDF document text
    • https://kaparatt.com/images/File/tobabodugawugeriruza.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/bebufadin.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/87148261819.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/49880622398.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/34630690559.pdfIn PDF document text
    • https://anakmeong.com/contents/files/gidokisazikeje.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/kojunuziduwokunuwejasife.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/27710486754.pdfIn PDF document text
    • https://avflash.nl/upload/files/jasudajawivid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+u+get+free+apps+on+androidPDF 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_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10804 bytes
SHA-256: a3d8174454cb9a26b18132db3424130f71f84c4e020a73a5b87128a63fb96f25
font_02_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 17884 bytes
SHA-256: 66b90f65ebf8bca372922576a4496917e4db233588f702a900aec54d3418373d

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