Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9a2e78ea9d59b7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 21:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d16a753231d22b1e2caea11ea93fb64 SHA-1: 03c021b9e97fb12d446291ea3479fed1e328a5cc SHA-256: be9a2e78ea9d59b75d124a8561195393e6365092e4eb0d80da55683cfa3f5075
196 Risk Score

Malware Insights

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

The PDF contains a high number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://lescourailleurs.com/upload/editor/file/farafukoraxevuzelutu.pdf In PDF document text
    • http://ventss.ru/userfiles/files/3766098016.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864c9f60c28---zazorawijegawusuzojenatel.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/kibobusozugisuwej.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132161bd9e5a---sejabusuwej.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/74695872944.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/fobibadasigugabugiluj.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tunutedelalibutimunafona.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/kulub.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/donifulavotagawum.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/sibuzekorizogulopelimema.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/20457796333.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8482b2d7406aacae44d7bbc6f0858318/67957073478.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/77406916737.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/73637740309.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/cea6d038e65ffad32c21b03b12487a26/nopiruwufokomibotu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2252323900b6e4702fe40ee25dd3d35/kerekobudosusafutu.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lexuva.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/kesufumokaxuvononapadew.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080780b5d3f6---38799629852.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f857bacb8d8---penakadalita.pdfIn PDF document text
    • https://aashianarealty.com/file/36846506051.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/19861733005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wattpad+yabanc%C4%B1+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 10248 bytes
SHA-256: a5abd1df42c3d34628bd619ad13cd3a397762e502aa168fb098e06b778998de8
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16232 bytes
SHA-256: b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 17692 bytes
SHA-256: f11eb8dd05262b38bccaf61e7d9043f7b0a3ad4b9d0e606e6b22d003a65965d7
font_03_sfnt_off00012f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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