Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8172789cfa06a6c…

MALICIOUS

PDF

71.1 KB Created: 2021-06-25 14:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 68e1b21565a5312797d6510ffc49353a SHA-1: eaadd2b039258bfe00ad4aad476d1f22cb46ee86 SHA-256: b8172789cfa06a6c1283ddd2434d3e401dcff38376037184e41bab94cec20a2f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely intended to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a deliberate effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9841a3cba98d9c71d45942c71d21063b/23345401397.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973f014cadc---naguruf.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa8462f8d---mazelatejo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847973e8ed9---25604339442.pdfIn PDF document text
    • https://sealskinz.ru/files/file/fujilutovazezog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb5d5e62c---mutanopixozanutibejaf.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ali0bljrmjivruar1g0363t4ms/diroxomemezapuxekudaxozo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/02adc258ed347a278cd9d9ed01a2bf6f/94513784873.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/xakivogo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd54becce1---76121248892.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d2d7a2acf932c129fdc1d08a3a11d0e8/fujox.pdfIn PDF document text
    • https://saam.vn/images/content/file/niforezimevelufuz.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb0ccb72---jagisemulawufudejefuxibo.pdfIn PDF document text
    • http://sport-way.ru/img/file/31674564938.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/tewusisozixuk.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/52497048827.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zazevadekozifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=a+low+down+dirty+shame+123moviesPDF 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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 11104 bytes
SHA-256: 57d6b272b55c7d76b0191b85140e8d586ce27f596859bac4f5b8ffeeac2df886
font_01_sfnt_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 16340 bytes
SHA-256: 52642b2cb0c2d0799f5c654d9d735b28807d04bab22e66424f0c7419fc865a02
font_02_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1