Malicious PDF — malware analysis report

Static analysis result for SHA-256 f742d625bac247f3…

MALICIOUS

PDF

81.9 KB Created: 2021-06-18 13:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaf4899a6f674e695dad60edfa969278 SHA-1: 86353e354b429b073acbf44c659b81b71aa24e7e SHA-256: f742d625bac247f3eaf0202289acabc5f5533a6e79f8e7e0c4a5847ee6ec7cc7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the structure of the links indicate a deliberate effort to obscure the final destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/dec902f602f4337b097790d25d75a9c6/sugabefuxukezozaxipununi.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cd5a8d34---57711544169.pdf
    • http://landpas.pl/upload/file/rowipezomawikatoragisop.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6774da42b---nulam.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9894017ac1ffe308c86636cdfe938079/17593476020.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ml5nbq4irihrm08cplk56ej0v6/lapaxixunopobuduligupi.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/qi9tmpruong27l0nnhge39pg9h/62059698396.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/kef483m230hv6srkm099i6v9n2/rapopeze.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/11a8vfb30g7pdm1p68nc9rako2/4341978775.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077f98d2dbf0---juxokufo.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lv7tnidkj1i7odv3icusg6iul7/zapewixabeni.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ea43082---fusemapixijewokubuterezat.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c62f384c9---jonevuroxusovamofawezenog.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2pchjri2ob434k3j4grb4d6ai6/dexaxopupuxi.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2326ccf61eb9ef02084624c9524eb3a8/44355218433.pdf
    • http://southport1969.com/clients/861680/File/suforokiguteva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+stop+ads+in+apps+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb15.bin
2cad2d1510038eab5eaf5a438eb6ba8f201e38cb36fb4777bcbeb3841abc62ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 4976 bytes
font_01_sfnt_off00010c13.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 1800 bytes
font_02_sfnt_off000114a0.bin
dcbaed52fa67a400db6336cb8335f8f0d0a2a7b3f010148caf56d15e2b71f86e
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 11140 bytes