Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b16940f48c52f7…

MALICIOUS

PDF

140.8 KB Created: 2021-06-06 18:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 89bb9330eb21343eb3ab81883fe10c93 SHA-1: fd47b044ea7eb532fcbec48fe910be6770e30dc0 SHA-256: 75b16940f48c52f7e4e5a851bcdacb63e610e20d619c7178b439cfb30c080738
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=francis+ponge+le+parti+pris+des+choses+pdf+gratuit PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e39c7f0ab2b86c5b38eef8cc732559d2/veloboborone.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/godekesaxunive.pdfIn PDF document text
    • https://mfdesign.hu/files/file/rigefitunupe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/noxasebazuxuzog.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8gduqp1k1hi0ctoseq32e8691/losifi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e3ssl1gabovhqth874bnhjf9ap/vorisapomulum.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d252e12b7d89a23a41e146a3a1a92215/51135297970.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1911435bbfe2b64020ae14583f5a5080/52362716800.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/kuzapipexaworapo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609870ad17812---61145018808.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608585b82e645---66219903940.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf9a83fd0---verekakesiwudazipek.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e60adec9ba79174f6ecedfc8840caf1e/38451411854.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affcba91f9f---20332247549.pdfPDF link annotation
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rjguhm8j6rn07l0m2h7ckmo565/30643288611.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/16260644773.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E88F 5372 bytes
SHA-256: f6418da18b2416e07b1a7b75d5159070a3a26e2d6654328a4f2f9e4cca857349
font_01_sfnt_off0001facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FACC 13740 bytes
SHA-256: 6863d146eb0696138895811ca03a93c6053ba6d9b12004ca865488f6ce1c7d77