Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3f1d131468f800…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 07:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7efe25f82a1217938189df68e651014e SHA-1: 4f94799be1b40c56da952c09c71fbf0c16cccdf9 SHA-256: 0e3f1d131468f80040104a702d198249c6036c6f1558d1bf288448048a423e0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further supports a phishing or malware distribution attack pattern. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://patanamachine.com/imgUpload/files/85111064842.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/83af72e4043f6f83e92b7da4bc6d814d/lojuvidu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cd32bb9a---3344350487.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/dopumoset.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xujinadugo.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/gusuwadetuvavufevama.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4b4e622804e7b47a37ac41a4db49a491/zuleseduleniwexisixati.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/dubabolivonukuwadumaxo.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/65530703660.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/sazekafetala.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/e74uect3tnssqc2es9ahuv6kgu/limulerezegotikowevamofeg.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/rudozetax.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/fanukotome.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/92597663421.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/vrrkafdc40tn7ab4rmk1abj844/xorif.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb963fd8462---fugadaletimekotalu.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/67003857878.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/4301968863.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/73202984702.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ggfqbrsla2bosta9iqnpp1idg5/92742801415.pdfIn PDF document text
    • https://akvaguru.hu/user/file/rurubovapafemekigi.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/45159635628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chronic+lymphocytic+leukemia+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D6 16016 bytes
SHA-256: c0892e10fe57483cb8675899a3bb4ea114cff9b0ca8b076721ece1f717ce2fe8
font_01_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 11056 bytes
SHA-256: 3c12f0a446941879bebffb5b8dc18e3d62a45bba7c91b92420bf476e2d5fe024

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