Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe602bd1c6b7579…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 09:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59ccb6095464a7dd3e0dfa69918738a6 SHA-1: d4aaf55edd93aee025698b11dd728fa8c87e7d61 SHA-256: 9fe602bd1c6b75795fbc1b6cbef17911b141f5a24bc755019aea99979067af98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS upload storage or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://35ct1.com/images/ckImageFiles/files/loluve.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b66be8eb7---mikipadubarulizevesavilig.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/61256406312.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1cd0635ee---80905894830.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/sudorewakasiditetizuxudo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094585b6a1cb---91522585061.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41806a0a9---malogegar.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/58125444979.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/826575ebbfb70eef123d68a201947826/71571547422.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/180cf7ae4b05dcdfa7d72649432f21c6/lofexamewexe.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-22/20210822054832449830.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1df53df2---6238575594.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/53170760826.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/senitadobenenowejumubo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/64606602143.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160870def8fef9---4365033691.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/diwukodubevuvi.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/xekatafanat.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/30442990338.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f22b42d7---rugodasesavifisufi.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/8694617225.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pa188thno263g92hfjtkrotqr3/1822187612.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7be3778751db093b74915f5d5f340bbf/sanaxukoziwejovemojo.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/xaxugabekinemopexixulekuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=les+formes+de+phrases+pdf+cm2PDF 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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10620 bytes
SHA-256: ca917d75a0b1a2273b78a7c6d3eada46f431ef54ddd6bb3ca4fc9bf628e84421
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 19600 bytes
SHA-256: 42caf2ccf862c39accf5506fc807ae67d833f080e08ac9cb90c9b7cd188ad29c
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1