Malicious PDF — malware analysis report

Static analysis result for SHA-256 6033a3c7e11fafb9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 07:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17cee04556e9d9e4559ce916f7db793d SHA-1: 538a61676c0675534a529fb05bf0e1d2e4025afe SHA-256: 6033a3c7e11fafb91f4b889bddb6eda9a0ac8195ff05e4ada6ee28438b4ece3d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm, with several pointing to compromised WordPress upload storage. The primary goal appears to be directing users to potentially harmful external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://infrive.ru/uplcv?utm_term=snapseed+light+effect+download PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/18ddcb314edec6d8bec8b63a16ea7ac3/41728683432.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/10593373551.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/sakizavavemegapowala.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffafed29f---78445895414.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a07ebe60b---36488300511.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/wunudiba.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qq2l7nq9g3gdouvd96euipe7e4/19963352690.pdfIn PDF document text
    • https://blv.by/upload/editor/files/23275470891.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cb5839eb36a8e5bd89026c371f7d5180/49979761810.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vamifanaraba.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136275b11378---18591141874.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/besitedebifabopizawozax.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210901001944.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/tuxotikoxikigofa.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/sojikodewuverilaxejo.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/waxusovigabinuporigu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6861c24a07a721c3d4e205e85d162c3e/nibepusudebutuj.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/kenepepozunokonile.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/61340268628.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614155c00263e---43090767620.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/tugezuzuwijojiw.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 18552 bytes
SHA-256: d74084f6da648b0c69d27adf858a29aa1feb8cbc86332535f4624bd2a07038d9
font_01_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 10960 bytes
SHA-256: 37807892a3b6a4e107ff83bf2f710cea5c2562dff6c48506a28cd47960615396

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