Malicious PDF — malware analysis report

Static analysis result for SHA-256 58afc64bb104e673…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 21:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43e030d95a139b8d929ca595638f113e SHA-1: 763b3f62c23e4c6907d73b5c478519cfd318772e SHA-256: 58afc64bb104e673034dfeba949ce04dbd0531ebbcb72cb5830fb3457d14aa71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to other malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://anandtouristcorporation.com/uploads/tivurukotozegaxurowut.pdf In PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/10719683612.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607461e89319f---vixojupux.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c297108111---20177096392.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/wekunonizuxodu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/45e01a3fb3caa61248e6bd401f0d76f3/jewefifekiwewamisip.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/96519988654.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/67933953569.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/paferutulawumidomenapad.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d717f37fc5---rotatozekomafogabota.pdfIn PDF document text
    • https://promise-land.com/upload/file/xijebafibadif.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/bubezizivukegenuba.pdfIn PDF document text
    • http://omg.su/upload/File/14403425227.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/badesamulesakirujekab.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b8cb4cf904da521c6ae93f21c7aed127/85740706619.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/64757842126.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/edgfbt53vulg2q91c2i9vsn7c2/37781457261.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/lajifiri.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/32214111836.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82259989911.pdfIn PDF document text
    • https://argumentua.com/i/file/88264622502.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/97fca92b6912f7176f16610e6ca0a8e1/raxow.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/wipezusirituw.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdf9253e7c---356389682.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/89639069925.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c63299c37428769b5804e42a90e55398/47408006651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+song+mony+monyPDF 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_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 10132 bytes
SHA-256: aa5868e8927f8f796f25df62a1950cc9c1edc127dad398c5a2226e452cf807ae
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 17480 bytes
SHA-256: ffe0f7f531def9a780b1eb7a6211e9867cd8dc187d0d69b713fef7f3428d59c6