Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6037ae05c557e8…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 00:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2129e3df646c92b65ecdcb6464292495 SHA-1: ae68581f5ccd50b55b92178920795ccd4ae866f3 SHA-256: 4a6037ae05c557e8fccbcd56f7f5557e0de8c3943fe1e2d0688fabf7c48e75a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to distribute phishing content or further malware stages, aligning with common PDF-based attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 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://huntic.ru/uplcv?utm_term=define+atherosclerosis+and+arteriosclerosis PDF link annotation
    • http://rogo-rotterdam.nl/files/bironafekodoferezagaji.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7f31f1df---85948275575.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf747cba4---gabanupeposerukopirano.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781f403df38---25688587617.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e44f7cd619ef58adab08b3e130f070e0/96477094710.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700672ca374---metomuronuki.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e1e251de8bd06112df55418b083d8498/rezotem.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733c70b8da6---84729955429.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/84857076176.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/taligugufewikowovux.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0b22a66a4e397f0f916ec1eb10736294/worosug.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/tadaganuxonokuwadi.pdfIn PDF document text
    • http://topas.lt/userfiles/file/48330514116.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/kojekugotuxok.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/22256852349.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/9638611860.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47326e086---60529302743.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/likiwetebamaguzabu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7feff19049---rewixivijenijozawidewa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0be5bcdc7---ropigaxigadesedo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/712a14267b477576439a8efc48b00c66/97267864961.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6807bae7ae3aabe0343090aeaeca2e4/89111228434.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8970c1b410---54845111099.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_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 10576 bytes
SHA-256: 6fd1db52f005efa84930050f7decb94a311f0cdd1a9960f284502445cca9a9ba
font_02_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 16804 bytes
SHA-256: 5257d17eba8b1ec9cce46ba166f003a9cff99efba1f3ae21db2ff2aecce9ace8

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