Malicious PDF — malware analysis report

Static analysis result for SHA-256 40339f8019a09114…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 10:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a47ae83c309987e619a4b53c27ec7010 SHA-1: 474aa3ed4ed43d53746b10f9f295f7e091d0ce87 SHA-256: 40339f8019a091142cdb3432ce8748f9ce74adce309dea942e5179329c845c1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=prophecy+medical+surgical+telemetry+exam+a+v1+answers PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04d6df056f---70612010171.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/95876603252.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/69825958584.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d626f3b84996c6beae7e444d092b1340/66828888391.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/luvofinupixu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082611b60278---fewisokipoxonar.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/82e2f1bb035881d61ea1da254d544e4d/sifavozofexakej.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/58722492589.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071093b1ddd9---43234572401.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17cd87758---wenedawadasig.pdfIn PDF document text
    • http://amdind.com/userfiles/file/notozidutexojamiraxapov.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/34ca9d459e5496ab4480fded158a22c9/90145608380.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gkl1pkjo2b8lu40jk2qj5fqjkl/35769682977.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/futiridivododop.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a413b7c4b---5554819496.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/kibegologazopufifuk.pdfIn PDF document text
    • http://aurora-c.jp/files/files/993451554.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b52ecdd0034a2c69bf748ae5d6a063a1/87691422802.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fjml3go71rud8jri3seluedj45/42442986920.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf18de84fc---vediwudowuxawosewazowes.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/xorafovuxodel.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ee679e8e0aa0df66aad439fa856693eb/kunixulisiwijumutu.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

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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 18096 bytes
SHA-256: 075d93e089f0a2024f8c546afb450ed96dc29b7afcf16a1f87d25f49f3156da2
font_02_sfnt_off00013a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A37 11484 bytes
SHA-256: 06eaedc69665e0a2fa342a13c49d4671e9b877daa144b09bac8c139600c138b2

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