Malicious PDF — malware analysis report

Static analysis result for SHA-256 2738cdaa2365cf91…

MALICIOUS

PDF

77.0 KB Created: 2021-08-10 02:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 13acac3e08e9ec9759375bf16b7f30a1 SHA-1: 062e091b1c966be15f0dd4cdf8527e496ce84c76 SHA-256: 2738cdaa2365cf911777c8ebb3eb6e617a7459675ca9a3ab67a0b29e2a94eec0
172 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on potentially compromised CMS uploads, and exhibits characteristics of a link farm designed to redirect users. The presence of a visual download button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webdulich.com/js/ckfinder/userfiles/files/tedokarezalexuxevuna.pdf In PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/8pdf8vrpoubslr5a7ejjvu0dq9/29911783779.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3a76f7a4---70564588576.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/gopitikeganalalexuk.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/67009332319.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/19219661379.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/25215261626.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sap1mo3hl9l7aptcvkair98432/rogukujuputajebe.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fegunupegamos.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2eb16b59f9cdfe3a2870d1ff792af227/8472802349.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/49adb5faf896eef2f6e8a09efee2085f/82017529580.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96295110362.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25133077946.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3fa400a1---39425711636.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/44549452109.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc373a13c2---wejijunumapasemajowavon.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/lenodoguvabavopunej.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba023ab9e---sikip.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/72774935112.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jdgt7capaii47nkqlqb97qb832/fazobotevapejigubivume.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pebuzupimamojaj.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/50313640039.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/af36d82142e3b3453201ff255c62ee7d/polibupedogisunuwimev.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/42422e83a60b0a5fc438b077a5b462a2/71959558963.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162845249043.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/36117778961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=upsc+prelims+answer+sheet+formatPDF 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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 16552 bytes
SHA-256: 63c853b6a64c8ea992866e65497cd663a37867a1b88dddc2cda3f47bf48b1228
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10840 bytes
SHA-256: 67024b426ec48e6cc990c61d675f18e8ca538fd623128635420decc931f54ad9
font_02_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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