Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fcb32544cc0301…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 05:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8370c7becefd6026eab18f5ff6dcedf0 SHA-1: 2321c4aa48be8fab15ad90664b9cc2b04c53c912 SHA-256: 19fcb32544cc0301a8c8db7b495ccaae6302f9812e3f3f00df5012d6152cc100
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead the user to a malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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 https://oniceh.ru/uplcv?utm_term=all+language+translator+apk+download PDF link annotation
    • https://artesapanaderia.xyz/aym_image/files/nepubaj.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/siwiworixejemadiguwabo.pdfIn PDF document text
    • https://penzion-palice.cz/content/zemipola.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea007b21c---74314074213.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/gigavuvetubutubunafum.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/kukezed.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/kezonapizivenebadifajuta.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109151430058195.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1009f7bc---malaramel.pdfIn PDF document text
    • https://redac.ch/upload/vepefejamiwutolibi.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/bipinutupejomenida.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/vujodumotimopojaso.pdfIn PDF document text
    • http://altus.pl/userfiles/file/92231759018.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7bdc99a38e53d2c44b70cc5fa77895c5/88180420034.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/kogus.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/wudibijuluj.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/70709665214.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/sixegozikunojodofokilim.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/disod.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091516132973499.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/fexego.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/zoridafitedakanobo.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/69771087957.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/pifebadoxuxuforut.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/75691203598.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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 19308 bytes
SHA-256: 4206cb6be33c78844911ca5b747680e5c78fed19af41465746cb54f0fdfaf17e
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10732 bytes
SHA-256: 86b65ae9cf6deb3b3c638a1886a04d39d0d5a4f531fa9d2d763765fd7aa827c6
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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