Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eab07731b3e21a3…

MALICIOUS

PDF

71.8 KB Created: 2021-06-25 21:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 35e32784e971571b8bcd29d212f4bd47 SHA-1: fc9da521f54422dbb3965f369838cdde5ea3b024 SHA-256: 8eab07731b3e21a3905fb7b5378f9e95bd96f5433da4e67d8eec39841f82366f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://pinturasoltra.com/images/slider/files/58921346586.pdf In PDF document text
    • https://peterdegendt.be/file/sujofogaxinudopejexujuw.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/50969934011.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160849deaa82aa---96153708586.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/4c47adbbd720ce1406dd2608de9a8a4e/79219806998.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/34ufneh1qrlki4dog7b9htc9s1/31425604697.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/0um1sd34g098g19kudnempkfvm/zudazuwinolazokujetup.pdfIn PDF document text
    • https://naoshima-habitant.com/xufevopupeg.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c8e8db690430a643985a3698b5577d4d/81450524450.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4afc23ef3b---17863086577.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fugexesulafati.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505041200392020.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/27114049606.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/juzopofikonexizokoxijo.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/44350627206.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/35527180413.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/pilokotus.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607378981f44d---37413950439.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7528f30b031a919725de10ca12f79111/13577928652.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/85152639378.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6d3b5ca9b43c26bceab22d9723427fcd/42052053208.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/93964a313d66b58869fbbbb6115f1318/bekikujapobadipodij.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b6fdafc2---84876985757.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/78862138473.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210529081009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sh+th+ch+worksheetsPDF 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_off0000bacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 15668 bytes
SHA-256: 7d522bd2e37fa0b24524a6c718f80893de2e70cb007fb2fc521f5a2b1721c40d
font_02_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 10176 bytes
SHA-256: bad314b75f3e229a722319f75ed2603b74f88e23c6ff56914488dc371f36e24a

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